283 lines
7.3 KiB
C
283 lines
7.3 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2010,2011 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/net/netbuff.h>
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#include <grub/dl.h>
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#include <grub/net.h>
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#include <grub/time.h>
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#include <grub/efi/api.h>
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#include <grub/efi/efi.h>
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#include <grub/i18n.h>
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GRUB_MOD_LICENSE ("GPLv3+");
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/* GUID. */
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static grub_efi_guid_t net_io_guid = GRUB_EFI_SIMPLE_NETWORK_GUID;
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static grub_efi_guid_t pxe_io_guid = GRUB_EFI_PXE_GUID;
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static grub_err_t
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send_card_buffer (struct grub_net_card *dev,
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struct grub_net_buff *pack)
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{
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grub_efi_status_t st;
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grub_efi_simple_network_t *net = dev->efi_net;
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grub_uint64_t limit_time = grub_get_time_ms () + 4000;
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void *txbuf;
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if (dev->txbusy)
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while (1)
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{
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txbuf = NULL;
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st = efi_call_3 (net->get_status, net, 0, &txbuf);
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if (st != GRUB_EFI_SUCCESS)
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return grub_error (GRUB_ERR_IO,
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N_("couldn't send network packet"));
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if (txbuf == dev->txbuf)
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{
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dev->txbusy = 0;
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break;
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}
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if (txbuf)
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{
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st = efi_call_7 (net->transmit, net, 0, dev->last_pkt_size,
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dev->txbuf, NULL, NULL, NULL);
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if (st != GRUB_EFI_SUCCESS)
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return grub_error (GRUB_ERR_IO,
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N_("couldn't send network packet"));
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}
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if (limit_time < grub_get_time_ms ())
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return grub_error (GRUB_ERR_TIMEOUT,
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N_("couldn't send network packet"));
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}
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dev->last_pkt_size = (pack->tail - pack->data);
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if (dev->last_pkt_size > dev->mtu)
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dev->last_pkt_size = dev->mtu;
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grub_memcpy (dev->txbuf, pack->data, dev->last_pkt_size);
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st = efi_call_7 (net->transmit, net, 0, dev->last_pkt_size,
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dev->txbuf, NULL, NULL, NULL);
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if (st != GRUB_EFI_SUCCESS)
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return grub_error (GRUB_ERR_IO, N_("couldn't send network packet"));
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/*
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The card may have sent out the packet immediately - set txbusy
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to 0 in this case.
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Cases were observed where checking txbuf at the next call
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of send_card_buffer() is too late: 0 is returned in txbuf and
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we run in the GRUB_ERR_TIMEOUT case above.
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Perhaps a timeout in the FW has discarded the recycle buffer.
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*/
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st = efi_call_3 (net->get_status, net, 0, &txbuf);
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dev->txbusy = !(st == GRUB_EFI_SUCCESS && txbuf == dev->txbuf);
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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)
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{
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grub_efi_simple_network_t *net = dev->efi_net;
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grub_err_t err;
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grub_efi_status_t st;
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grub_efi_uintn_t bufsize = dev->rcvbufsize;
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struct grub_net_buff *nb;
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int i;
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for (i = 0; i < 2; i++)
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{
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if (!dev->rcvbuf)
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dev->rcvbuf = grub_malloc (dev->rcvbufsize);
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if (!dev->rcvbuf)
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return NULL;
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st = efi_call_7 (net->receive, net, NULL, &bufsize,
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dev->rcvbuf, NULL, NULL, NULL);
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if (st != GRUB_EFI_BUFFER_TOO_SMALL)
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break;
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dev->rcvbufsize = 2 * ALIGN_UP (dev->rcvbufsize > bufsize
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? dev->rcvbufsize : bufsize, 64);
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grub_free (dev->rcvbuf);
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dev->rcvbuf = 0;
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}
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if (st != GRUB_EFI_SUCCESS)
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return NULL;
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nb = grub_netbuff_alloc (bufsize + 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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if (grub_netbuff_reserve (nb, 2))
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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_memcpy (nb->data, dev->rcvbuf, bufsize);
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err = grub_netbuff_put (nb, bufsize);
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if (err)
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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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return nb;
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}
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static struct grub_net_card_driver efidriver =
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{
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.name = "efinet",
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.send = send_card_buffer,
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.recv = get_card_packet
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};
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grub_efi_handle_t
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grub_efinet_get_device_handle (struct grub_net_card *card)
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{
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if (!card || card->driver != &efidriver)
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return 0;
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return card->efi_handle;
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}
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static void
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grub_efinet_findcards (void)
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{
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grub_efi_uintn_t num_handles;
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grub_efi_handle_t *handles;
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grub_efi_handle_t *handle;
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int i = 0;
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/* Find handles which support the disk io interface. */
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handles = grub_efi_locate_handle (GRUB_EFI_BY_PROTOCOL, &net_io_guid,
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0, &num_handles);
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if (! handles)
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return;
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for (handle = handles; num_handles--; handle++)
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{
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grub_efi_simple_network_t *net;
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struct grub_net_card *card;
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net = grub_efi_open_protocol (*handle, &net_io_guid,
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GRUB_EFI_OPEN_PROTOCOL_GET_PROTOCOL);
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if (! net)
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/* This should not happen... Why? */
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continue;
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if (net->mode->state == GRUB_EFI_NETWORK_STOPPED
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&& efi_call_1 (net->start, net) != GRUB_EFI_SUCCESS)
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continue;
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if (net->mode->state == GRUB_EFI_NETWORK_STOPPED)
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continue;
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if (net->mode->state == GRUB_EFI_NETWORK_STARTED
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&& efi_call_3 (net->initialize, net, 0, 0) != GRUB_EFI_SUCCESS)
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continue;
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card = grub_zalloc (sizeof (struct grub_net_card));
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if (!card)
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{
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grub_print_error ();
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grub_free (handles);
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return;
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}
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card->mtu = net->mode->max_packet_size;
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card->txbufsize = ALIGN_UP (card->mtu, 64) + 256;
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card->txbuf = grub_zalloc (card->txbufsize);
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if (!card->txbuf)
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{
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grub_print_error ();
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grub_free (handles);
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grub_free (card);
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return;
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}
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card->txbusy = 0;
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card->rcvbufsize = ALIGN_UP (card->mtu, 64) + 256;
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card->name = grub_xasprintf ("efinet%d", i++);
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card->driver = &efidriver;
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card->flags = 0;
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card->default_address.type = GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET;
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grub_memcpy (card->default_address.mac,
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net->mode->current_address,
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sizeof (card->default_address.mac));
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card->efi_net = net;
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card->efi_handle = *handle;
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grub_net_card_register (card);
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}
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grub_free (handles);
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}
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static void
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grub_efi_net_config_real (grub_efi_handle_t hnd, char **device,
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char **path)
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{
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struct grub_net_card *card;
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grub_efi_device_path_t *dp;
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dp = grub_efi_get_device_path (hnd);
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if (! dp)
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return;
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FOR_NET_CARDS (card)
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{
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grub_efi_device_path_t *cdp;
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struct grub_efi_pxe *pxe;
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struct grub_efi_pxe_mode *pxe_mode;
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if (card->driver != &efidriver)
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continue;
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cdp = grub_efi_get_device_path (card->efi_handle);
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if (! cdp)
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continue;
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if (grub_efi_compare_device_paths (dp, cdp) != 0)
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continue;
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pxe = grub_efi_open_protocol (hnd, &pxe_io_guid,
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GRUB_EFI_OPEN_PROTOCOL_GET_PROTOCOL);
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if (! pxe)
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continue;
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pxe_mode = pxe->mode;
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grub_net_configure_by_dhcp_ack (card->name, card, 0,
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(struct grub_net_bootp_packet *)
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&pxe_mode->dhcp_ack,
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sizeof (pxe_mode->dhcp_ack),
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1, device, path);
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return;
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}
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}
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GRUB_MOD_INIT(efinet)
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{
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grub_efinet_findcards ();
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grub_efi_net_config = grub_efi_net_config_real;
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}
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GRUB_MOD_FINI(efinet)
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{
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struct grub_net_card *card, *next;
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FOR_NET_CARDS_SAFE (card, next)
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if (card->driver == &efidriver)
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grub_net_card_unregister (card);
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}
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