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grub/grub-core/net/drivers/efi/efinet.c
Josef Bacik 4fe8e6d4a1 efinet: handle get_status() on buggy firmware properly 
The EFI spec indicates that get_status() should return the address of the buffer
we passed into transmit to indicate the the buffer was transmitted.  However we
have boxes where the firmware returns some arbitrary address instead, which
makes grub think that we've not sent anything.  So since we have the SNP stuff
opened in exclusive mode just assume any non-NULL txbuf means that our transmit
occurred properly.  This makes grub able to do its networking stuff properly on
our broken firmware.  Thanks,

cc: Peter Jones <pjones@redhat.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>
2015-08-09 16:37:26 +03:00

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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2010,2011 Free Software Foundation, Inc.
*
* GRUB 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 3 of the License, or
* (at your option) any later version.
*
* GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/net/netbuff.h>
#include <grub/dl.h>
#include <grub/net.h>
#include <grub/time.h>
#include <grub/efi/api.h>
#include <grub/efi/efi.h>
#include <grub/i18n.h>
GRUB_MOD_LICENSE ("GPLv3+");
/* GUID. */
static grub_efi_guid_t net_io_guid = GRUB_EFI_SIMPLE_NETWORK_GUID;
static grub_efi_guid_t pxe_io_guid = GRUB_EFI_PXE_GUID;
static grub_err_t
send_card_buffer (struct grub_net_card *dev,
struct grub_net_buff *pack)
{
grub_efi_status_t st;
grub_efi_simple_network_t *net = dev->efi_net;
grub_uint64_t limit_time = grub_get_time_ms () + 4000;
void *txbuf;
if (dev->txbusy)
while (1)
{
txbuf = NULL;
st = efi_call_3 (net->get_status, net, 0, &txbuf);
if (st != GRUB_EFI_SUCCESS)
return grub_error (GRUB_ERR_IO,
N_("couldn't send network packet"));
/*
Some buggy firmware could return an arbitrary address instead of the
txbuf address we trasmitted, so just check that txbuf is non NULL
for success. This is ok because we open the SNP protocol in
exclusive mode so we know we're the only ones transmitting on this
box and since we only transmit one packet at a time we know our
transmit was successfull.
*/
if (txbuf)
{
dev->txbusy = 0;
break;
}
if (limit_time < grub_get_time_ms ())
return grub_error (GRUB_ERR_TIMEOUT,
N_("couldn't send network packet"));
}
dev->last_pkt_size = (pack->tail - pack->data);
if (dev->last_pkt_size > dev->mtu)
dev->last_pkt_size = dev->mtu;
grub_memcpy (dev->txbuf, pack->data, dev->last_pkt_size);
st = efi_call_7 (net->transmit, net, 0, dev->last_pkt_size,
dev->txbuf, NULL, NULL, NULL);
if (st != GRUB_EFI_SUCCESS)
return grub_error (GRUB_ERR_IO, N_("couldn't send network packet"));
/*
The card may have sent out the packet immediately - set txbusy
to 0 in this case.
Cases were observed where checking txbuf at the next call
of send_card_buffer() is too late: 0 is returned in txbuf and
we run in the GRUB_ERR_TIMEOUT case above.
Perhaps a timeout in the FW has discarded the recycle buffer.
*/
txbuf = NULL;
st = efi_call_3 (net->get_status, net, 0, &txbuf);
dev->txbusy = !(st == GRUB_EFI_SUCCESS && txbuf);
return GRUB_ERR_NONE;
}
static struct grub_net_buff *
get_card_packet (struct grub_net_card *dev)
{
grub_efi_simple_network_t *net = dev->efi_net;
grub_err_t err;
grub_efi_status_t st;
grub_efi_uintn_t bufsize = dev->rcvbufsize;
struct grub_net_buff *nb;
int i;
for (i = 0; i < 2; i++)
{
if (!dev->rcvbuf)
dev->rcvbuf = grub_malloc (dev->rcvbufsize);
if (!dev->rcvbuf)
return NULL;
st = efi_call_7 (net->receive, net, NULL, &bufsize,
dev->rcvbuf, NULL, NULL, NULL);
if (st != GRUB_EFI_BUFFER_TOO_SMALL)
break;
dev->rcvbufsize = 2 * ALIGN_UP (dev->rcvbufsize > bufsize
? dev->rcvbufsize : bufsize, 64);
grub_free (dev->rcvbuf);
dev->rcvbuf = 0;
}
if (st != GRUB_EFI_SUCCESS)
return NULL;
nb = grub_netbuff_alloc (bufsize + 2);
if (!nb)
return NULL;
/* Reserve 2 bytes so that 2 + 14/18 bytes of ethernet header is divisible
by 4. So that IP header is aligned on 4 bytes. */
if (grub_netbuff_reserve (nb, 2))
{
grub_netbuff_free (nb);
return NULL;
}
grub_memcpy (nb->data, dev->rcvbuf, bufsize);
err = grub_netbuff_put (nb, bufsize);
if (err)
{
grub_netbuff_free (nb);
return NULL;
}
return nb;
}
static grub_err_t
open_card (struct grub_net_card *dev)
{
grub_efi_simple_network_t *net;
/* Try to reopen SNP exlusively to close any active MNP protocol instance
that may compete for packet polling
*/
net = grub_efi_open_protocol (dev->efi_handle, &net_io_guid,
GRUB_EFI_OPEN_PROTOCOL_BY_EXCLUSIVE);
if (net)
{
if (net->mode->state == GRUB_EFI_NETWORK_STOPPED
&& efi_call_1 (net->start, net) != GRUB_EFI_SUCCESS)
return grub_error (GRUB_ERR_NET_NO_CARD, "%s: net start failed",
dev->name);
if (net->mode->state == GRUB_EFI_NETWORK_STOPPED)
return grub_error (GRUB_ERR_NET_NO_CARD, "%s: card stopped",
dev->name);
if (net->mode->state == GRUB_EFI_NETWORK_STARTED
&& efi_call_3 (net->initialize, net, 0, 0) != GRUB_EFI_SUCCESS)
return grub_error (GRUB_ERR_NET_NO_CARD, "%s: net initialize failed",
dev->name);
/* Enable hardware receive filters if driver declares support for it.
We need unicast and broadcast and additionaly all nodes and
solicited multicast for IPv6. Solicited multicast is per-IPv6
address and we currently do not have API to do it so simply
try to enable receive of all multicast packets or evertyhing in
the worst case (i386 PXE driver always enables promiscuous too).
This does trust firmware to do what it claims to do.
*/
if (net->mode->receive_filter_mask)
{
grub_uint32_t filters = GRUB_EFI_SIMPLE_NETWORK_RECEIVE_UNICAST |
GRUB_EFI_SIMPLE_NETWORK_RECEIVE_BROADCAST |
GRUB_EFI_SIMPLE_NETWORK_RECEIVE_PROMISCUOUS_MULTICAST;
filters &= net->mode->receive_filter_mask;
if (!(filters & GRUB_EFI_SIMPLE_NETWORK_RECEIVE_PROMISCUOUS_MULTICAST))
filters |= (net->mode->receive_filter_mask &
GRUB_EFI_SIMPLE_NETWORK_RECEIVE_PROMISCUOUS);
efi_call_6 (net->receive_filters, net, filters, 0, 0, 0, NULL);
}
efi_call_4 (grub_efi_system_table->boot_services->close_protocol,
dev->efi_net, &net_io_guid,
grub_efi_image_handle, dev->efi_handle);
dev->efi_net = net;
}
/* If it failed we just try to run as best as we can */
return GRUB_ERR_NONE;
}
static void
close_card (struct grub_net_card *dev)
{
efi_call_1 (dev->efi_net->shutdown, dev->efi_net);
efi_call_1 (dev->efi_net->stop, dev->efi_net);
efi_call_4 (grub_efi_system_table->boot_services->close_protocol,
dev->efi_net, &net_io_guid,
grub_efi_image_handle, dev->efi_handle);
}
static struct grub_net_card_driver efidriver =
{
.name = "efinet",
.open = open_card,
.close = close_card,
.send = send_card_buffer,
.recv = get_card_packet
};
grub_efi_handle_t
grub_efinet_get_device_handle (struct grub_net_card *card)
{
if (!card || card->driver != &efidriver)
return 0;
return card->efi_handle;
}
static void
grub_efinet_findcards (void)
{
grub_efi_uintn_t num_handles;
grub_efi_handle_t *handles;
grub_efi_handle_t *handle;
int i = 0;
/* Find handles which support the disk io interface. */
handles = grub_efi_locate_handle (GRUB_EFI_BY_PROTOCOL, &net_io_guid,
0, &num_handles);
if (! handles)
return;
for (handle = handles; num_handles--; handle++)
{
grub_efi_simple_network_t *net;
struct grub_net_card *card;
grub_efi_device_path_t *dp, *parent = NULL, *child = NULL;
/* EDK2 UEFI PXE driver creates IPv4 and IPv6 messaging devices as
children of main MAC messaging device. We only need one device with
bound SNP per physical card, otherwise they compete with each other
when polling for incoming packets.
*/
dp = grub_efi_get_device_path (*handle);
if (!dp)
continue;
for (; ! GRUB_EFI_END_ENTIRE_DEVICE_PATH (dp); dp = GRUB_EFI_NEXT_DEVICE_PATH (dp))
{
parent = child;
child = dp;
}
if (child
&& GRUB_EFI_DEVICE_PATH_TYPE (child) == GRUB_EFI_MESSAGING_DEVICE_PATH_TYPE
&& (GRUB_EFI_DEVICE_PATH_SUBTYPE (child) == GRUB_EFI_IPV4_DEVICE_PATH_SUBTYPE
|| GRUB_EFI_DEVICE_PATH_SUBTYPE (child) == GRUB_EFI_IPV6_DEVICE_PATH_SUBTYPE)
&& parent
&& GRUB_EFI_DEVICE_PATH_TYPE (parent) == GRUB_EFI_MESSAGING_DEVICE_PATH_TYPE
&& GRUB_EFI_DEVICE_PATH_SUBTYPE (parent) == GRUB_EFI_MAC_ADDRESS_DEVICE_PATH_SUBTYPE)
continue;
net = grub_efi_open_protocol (*handle, &net_io_guid,
GRUB_EFI_OPEN_PROTOCOL_GET_PROTOCOL);
if (! net)
/* This should not happen... Why? */
continue;
if (net->mode->state == GRUB_EFI_NETWORK_STOPPED
&& efi_call_1 (net->start, net) != GRUB_EFI_SUCCESS)
continue;
if (net->mode->state == GRUB_EFI_NETWORK_STOPPED)
continue;
if (net->mode->state == GRUB_EFI_NETWORK_STARTED
&& efi_call_3 (net->initialize, net, 0, 0) != GRUB_EFI_SUCCESS)
continue;
card = grub_zalloc (sizeof (struct grub_net_card));
if (!card)
{
grub_print_error ();
grub_free (handles);
return;
}
card->mtu = net->mode->max_packet_size;
card->txbufsize = ALIGN_UP (card->mtu, 64) + 256;
card->txbuf = grub_zalloc (card->txbufsize);
if (!card->txbuf)
{
grub_print_error ();
grub_free (handles);
grub_free (card);
return;
}
card->txbusy = 0;
card->rcvbufsize = ALIGN_UP (card->mtu, 64) + 256;
card->name = grub_xasprintf ("efinet%d", i++);
card->driver = &efidriver;
card->flags = 0;
card->default_address.type = GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET;
grub_memcpy (card->default_address.mac,
net->mode->current_address,
sizeof (card->default_address.mac));
card->efi_net = net;
card->efi_handle = *handle;
grub_net_card_register (card);
}
grub_free (handles);
}
static void
grub_efi_net_config_real (grub_efi_handle_t hnd, char **device,
char **path)
{
struct grub_net_card *card;
grub_efi_device_path_t *dp;
dp = grub_efi_get_device_path (hnd);
if (! dp)
return;
FOR_NET_CARDS (card)
{
grub_efi_device_path_t *cdp;
struct grub_efi_pxe *pxe;
struct grub_efi_pxe_mode *pxe_mode;
if (card->driver != &efidriver)
continue;
cdp = grub_efi_get_device_path (card->efi_handle);
if (! cdp)
continue;
if (grub_efi_compare_device_paths (dp, cdp) != 0)
{
grub_efi_device_path_t *ldp, *dup_dp, *dup_ldp;
int match;
/* EDK2 UEFI PXE driver creates pseudo devices with type IPv4/IPv6
as children of Ethernet card and binds PXE and Load File protocols
to it. Loaded Image Device Path protocol will point to these pseudo
devices. We skip them when enumerating cards, so here we need to
find matching MAC device.
*/
ldp = grub_efi_find_last_device_path (dp);
if (GRUB_EFI_DEVICE_PATH_TYPE (ldp) != GRUB_EFI_MESSAGING_DEVICE_PATH_TYPE
|| (GRUB_EFI_DEVICE_PATH_SUBTYPE (ldp) != GRUB_EFI_IPV4_DEVICE_PATH_SUBTYPE
&& GRUB_EFI_DEVICE_PATH_SUBTYPE (ldp) != GRUB_EFI_IPV6_DEVICE_PATH_SUBTYPE))
continue;
dup_dp = grub_efi_duplicate_device_path (dp);
if (!dup_dp)
continue;
dup_ldp = grub_efi_find_last_device_path (dup_dp);
dup_ldp->type = GRUB_EFI_END_DEVICE_PATH_TYPE;
dup_ldp->subtype = GRUB_EFI_END_ENTIRE_DEVICE_PATH_SUBTYPE;
dup_ldp->length = sizeof (*dup_ldp);
match = grub_efi_compare_device_paths (dup_dp, cdp) == 0;
grub_free (dup_dp);
if (!match)
continue;
}
pxe = grub_efi_open_protocol (hnd, &pxe_io_guid,
GRUB_EFI_OPEN_PROTOCOL_GET_PROTOCOL);
if (! pxe)
continue;
pxe_mode = pxe->mode;
grub_net_configure_by_dhcp_ack (card->name, card, 0,
(struct grub_net_bootp_packet *)
&pxe_mode->dhcp_ack,
sizeof (pxe_mode->dhcp_ack),
1, device, path);
return;
}
}
GRUB_MOD_INIT(efinet)
{
grub_efinet_findcards ();
grub_efi_net_config = grub_efi_net_config_real;
}
GRUB_MOD_FINI(efinet)
{
struct grub_net_card *card, *next;
FOR_NET_CARDS_SAFE (card, next)
if (card->driver == &efidriver)
grub_net_card_unregister (card);
}
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