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grub/grub-core/net/drivers/i386/pc/pxe.c

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/* pxe.c - Driver to provide access to the pxe filesystem */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2008,2009,2011 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/dl.h>
#include <grub/net.h>
#include <grub/mm.h>
#include <grub/file.h>
#include <grub/misc.h>
#include <grub/env.h>
#include <grub/i18n.h>
#include <grub/loader.h>
#include <grub/machine/pxe.h>
#include <grub/machine/int.h>
#include <grub/machine/memory.h>
#include <grub/machine/kernel.h>
GRUB_MOD_LICENSE ("GPLv3+");
#define SEGMENT(x) ((x) >> 4)
#define OFFSET(x) ((x) & 0xF)
#define SEGOFS(x) ((SEGMENT(x) << 16) + OFFSET(x))
#define LINEAR(x) (void *) ((((x) >> 16) << 4) + ((x) & 0xFFFF))
struct grub_pxe_undi_open
{
grub_uint16_t status;
grub_uint16_t open_flag;
grub_uint16_t pkt_filter;
grub_uint16_t mcast_count;
grub_uint8_t mcast[8][6];
} GRUB_PACKED;
struct grub_pxe_undi_info
{
grub_uint16_t status;
grub_uint16_t base_io;
grub_uint16_t int_number;
grub_uint16_t mtu;
grub_uint16_t hwtype;
grub_uint16_t hwaddrlen;
grub_uint8_t current_addr[16];
grub_uint8_t permanent_addr[16];
grub_uint32_t romaddr;
grub_uint16_t rxbufct;
grub_uint16_t txbufct;
} GRUB_PACKED;
struct grub_pxe_undi_isr
{
grub_uint16_t status;
grub_uint16_t func_flag;
grub_uint16_t buffer_len;
grub_uint16_t frame_len;
grub_uint16_t frame_hdr_len;
grub_uint32_t buffer;
grub_uint8_t prot_type;
grub_uint8_t pkt_type;
} GRUB_PACKED;
enum
{
GRUB_PXE_ISR_IN_START = 1,
GRUB_PXE_ISR_IN_PROCESS,
GRUB_PXE_ISR_IN_GET_NEXT
};
enum
{
GRUB_PXE_ISR_OUT_OURS = 0,
GRUB_PXE_ISR_OUT_NOT_OURS = 1
};
enum
{
GRUB_PXE_ISR_OUT_DONE = 0,
GRUB_PXE_ISR_OUT_TRANSMIT = 2,
GRUB_PXE_ISR_OUT_RECEIVE = 3,
GRUB_PXE_ISR_OUT_BUSY = 4,
};
struct grub_pxe_undi_transmit
{
grub_uint16_t status;
grub_uint8_t protocol;
grub_uint8_t xmitflag;
grub_uint32_t dest;
grub_uint32_t tbd;
grub_uint32_t reserved[2];
} GRUB_PACKED;
struct grub_pxe_undi_tbd
{
grub_uint16_t len;
grub_uint32_t buf;
grub_uint16_t blk_count;
struct
{
grub_uint8_t ptr_type;
grub_uint8_t reserved;
grub_uint16_t len;
grub_uint32_t ptr;
} blocks[8];
} GRUB_PACKED;
struct grub_pxe_bangpxe *grub_pxe_pxenv;
static grub_uint32_t pxe_rm_entry = 0;
static struct grub_pxe_bangpxe *
grub_pxe_scan (void)
{
struct grub_bios_int_registers regs;
struct grub_pxenv *pxenv;
struct grub_pxe_bangpxe *bangpxe;
regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
regs.ebx = 0;
regs.ecx = 0;
regs.eax = 0x5650;
regs.es = 0;
grub_bios_interrupt (0x1a, &regs);
if ((regs.eax & 0xffff) != 0x564e)
return NULL;
pxenv = (struct grub_pxenv *) ((regs.es << 4) + (regs.ebx & 0xffff));
if (grub_memcmp (pxenv->signature, GRUB_PXE_SIGNATURE,
sizeof (pxenv->signature))
!= 0)
return NULL;
if (pxenv->version < 0x201)
return NULL;
bangpxe = (void *) ((((pxenv->pxe_ptr & 0xffff0000) >> 16) << 4)
+ (pxenv->pxe_ptr & 0xffff));
if (!bangpxe)
return NULL;
if (grub_memcmp (bangpxe->signature, GRUB_PXE_BANGPXE_SIGNATURE,
sizeof (bangpxe->signature)) != 0)
return NULL;
pxe_rm_entry = bangpxe->rm_entry;
return bangpxe;
}
static struct grub_net_buff *
grub_pxe_recv (struct grub_net_card *dev __attribute__ ((unused)))
{
struct grub_pxe_undi_isr *isr;
static int in_progress = 0;
grub_uint8_t *ptr, *end;
struct grub_net_buff *buf;
isr = (void *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR;
if (!in_progress)
{
grub_memset (isr, 0, sizeof (*isr));
isr->func_flag = GRUB_PXE_ISR_IN_START;
grub_pxe_call (GRUB_PXENV_UNDI_ISR, isr, pxe_rm_entry);
/* Normally according to the specification we should also check
that isr->func_flag != GRUB_PXE_ISR_OUT_OURS but unfortunately it
breaks on intel cards.
*/
if (isr->status)
{
in_progress = 0;
return NULL;
}
grub_memset (isr, 0, sizeof (*isr));
isr->func_flag = GRUB_PXE_ISR_IN_PROCESS;
grub_pxe_call (GRUB_PXENV_UNDI_ISR, isr, pxe_rm_entry);
}
else
{
grub_memset (isr, 0, sizeof (*isr));
isr->func_flag = GRUB_PXE_ISR_IN_GET_NEXT;
grub_pxe_call (GRUB_PXENV_UNDI_ISR, isr, pxe_rm_entry);
}
while (isr->func_flag != GRUB_PXE_ISR_OUT_RECEIVE)
{
if (isr->status || isr->func_flag == GRUB_PXE_ISR_OUT_DONE)
{
in_progress = 0;
return NULL;
}
grub_memset (isr, 0, sizeof (*isr));
isr->func_flag = GRUB_PXE_ISR_IN_GET_NEXT;
grub_pxe_call (GRUB_PXENV_UNDI_ISR, isr, pxe_rm_entry);
}
buf = grub_netbuff_alloc (isr->frame_len + 2);
if (!buf)
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. */
grub_netbuff_reserve (buf, 2);
if (!buf)
{
grub_netbuff_free (buf);
return NULL;
}
ptr = buf->data;
end = ptr + isr->frame_len;
grub_netbuff_put (buf, isr->frame_len);
grub_memcpy (ptr, LINEAR (isr->buffer), isr->buffer_len);
ptr += isr->buffer_len;
while (ptr < end)
{
grub_memset (isr, 0, sizeof (*isr));
isr->func_flag = GRUB_PXE_ISR_IN_GET_NEXT;
grub_pxe_call (GRUB_PXENV_UNDI_ISR, isr, pxe_rm_entry);
if (isr->status || isr->func_flag != GRUB_PXE_ISR_OUT_RECEIVE)
{
in_progress = 1;
grub_netbuff_free (buf);
return NULL;
}
grub_memcpy (ptr, LINEAR (isr->buffer), isr->buffer_len);
ptr += isr->buffer_len;
}
in_progress = 1;
return buf;
}
static grub_err_t
grub_pxe_send (struct grub_net_card *dev __attribute__ ((unused)),
struct grub_net_buff *pack)
{
struct grub_pxe_undi_transmit *trans;
struct grub_pxe_undi_tbd *tbd;
char *buf;
trans = (void *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR;
grub_memset (trans, 0, sizeof (*trans));
tbd = (void *) (GRUB_MEMORY_MACHINE_SCRATCH_ADDR + 128);
grub_memset (tbd, 0, sizeof (*tbd));
buf = (void *) (GRUB_MEMORY_MACHINE_SCRATCH_ADDR + 256);
grub_memcpy (buf, pack->data, pack->tail - pack->data);
trans->tbd = SEGOFS ((grub_addr_t) tbd);
trans->protocol = 0;
tbd->len = pack->tail - pack->data;
tbd->buf = SEGOFS ((grub_addr_t) buf);
grub_pxe_call (GRUB_PXENV_UNDI_TRANSMIT, trans, pxe_rm_entry);
if (trans->status)
return grub_error (GRUB_ERR_IO, N_("couldn't send network packet"));
return 0;
}
static void
grub_pxe_close (struct grub_net_card *dev __attribute__ ((unused)))
{
if (pxe_rm_entry)
grub_pxe_call (GRUB_PXENV_UNDI_CLOSE,
(void *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR,
pxe_rm_entry);
}
static grub_err_t
grub_pxe_open (struct grub_net_card *dev __attribute__ ((unused)))
{
struct grub_pxe_undi_open *ou;
ou = (void *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR;
grub_memset (ou, 0, sizeof (*ou));
ou->pkt_filter = 4;
grub_pxe_call (GRUB_PXENV_UNDI_OPEN, ou, pxe_rm_entry);
if (ou->status)
return grub_error (GRUB_ERR_IO, "can't open UNDI");
return GRUB_ERR_NONE;
}
struct grub_net_card_driver grub_pxe_card_driver =
{
.open = grub_pxe_open,
.close = grub_pxe_close,
.send = grub_pxe_send,
.recv = grub_pxe_recv
};
struct grub_net_card grub_pxe_card =
{
.driver = &grub_pxe_card_driver,
.name = "pxe"
};
static grub_err_t
grub_pxe_shutdown (int flags)
{
if (flags & GRUB_LOADER_FLAG_PXE_NOT_UNLOAD)
return GRUB_ERR_NONE;
if (!pxe_rm_entry)
return GRUB_ERR_NONE;
grub_pxe_call (GRUB_PXENV_UNDI_CLOSE,
(void *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR,
pxe_rm_entry);
grub_pxe_call (GRUB_PXENV_UNDI_SHUTDOWN,
(void *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR,
pxe_rm_entry);
grub_pxe_call (GRUB_PXENV_UNLOAD_STACK,
(void *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR,
pxe_rm_entry);
pxe_rm_entry = 0;
grub_net_card_unregister (&grub_pxe_card);
return GRUB_ERR_NONE;
}
/* Nothing we can do. */
static grub_err_t
grub_pxe_restore (void)
{
return GRUB_ERR_NONE;
}
void *
grub_pxe_get_cached (grub_uint16_t type)
{
struct grub_pxenv_get_cached_info ci;
ci.packet_type = type;
ci.buffer = 0;
ci.buffer_size = 0;
grub_pxe_call (GRUB_PXENV_GET_CACHED_INFO, &ci, pxe_rm_entry);
if (ci.status)
return 0;
return LINEAR (ci.buffer);
}
static void
grub_pc_net_config_real (char **device, char **path)
{
struct grub_net_bootp_packet *bp;
bp = grub_pxe_get_cached (GRUB_PXENV_PACKET_TYPE_DHCP_ACK);
if (!bp)
return;
grub_net_configure_by_dhcp_ack ("pxe", &grub_pxe_card, 0,
bp, GRUB_PXE_BOOTP_SIZE,
1, device, path);
}
static struct grub_preboot *fini_hnd;
GRUB_MOD_INIT(pxe)
{
struct grub_pxe_bangpxe *pxenv;
struct grub_pxe_undi_info *ui;
unsigned i;
pxenv = grub_pxe_scan ();
if (! pxenv)
return;
ui = (void *) GRUB_MEMORY_MACHINE_SCRATCH_ADDR;
grub_memset (ui, 0, sizeof (*ui));
grub_pxe_call (GRUB_PXENV_UNDI_GET_INFORMATION, ui, pxe_rm_entry);
grub_memcpy (grub_pxe_card.default_address.mac, ui->current_addr,
sizeof (grub_pxe_card.default_address.mac));
for (i = 0; i < sizeof (grub_pxe_card.default_address.mac); i++)
if (grub_pxe_card.default_address.mac[i] != 0)
break;
if (i != sizeof (grub_pxe_card.default_address.mac))
{
for (i = 0; i < sizeof (grub_pxe_card.default_address.mac); i++)
if (grub_pxe_card.default_address.mac[i] != 0xff)
break;
}
if (i == sizeof (grub_pxe_card.default_address.mac))
grub_memcpy (grub_pxe_card.default_address.mac, ui->permanent_addr,
sizeof (grub_pxe_card.default_address.mac));
grub_pxe_card.mtu = ui->mtu;
grub_pxe_card.default_address.type = GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET;
grub_net_card_register (&grub_pxe_card);
grub_pc_net_config = grub_pc_net_config_real;
fini_hnd = grub_loader_register_preboot_hook (grub_pxe_shutdown,
grub_pxe_restore,
GRUB_LOADER_PREBOOT_HOOK_PRIO_DISK);
}
GRUB_MOD_FINI(pxe)
{
grub_pc_net_config = 0;
grub_pxe_shutdown (0);
grub_loader_unregister_preboot_hook (fini_hnd);
}
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