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grub/grub-core/net/tftp.c
Vladimir Serbinenko cf8d6bbd9e * grub-core/net/tftp.c: Retransmit ack when rereceiving old packet. 
Try to handle more than 0xFFFF packets.
2013-10-27 19:15:37 +01:00

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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/misc.h>
#include <grub/net/udp.h>
#include <grub/net/ip.h>
#include <grub/net/ethernet.h>
#include <grub/net/netbuff.h>
#include <grub/net.h>
#include <grub/mm.h>
#include <grub/dl.h>
#include <grub/file.h>
#include <grub/priority_queue.h>
#include <grub/i18n.h>
GRUB_MOD_LICENSE ("GPLv3+");
/* IP port for the MTFTP server used for Intel's PXE */
enum
{
MTFTP_SERVER_PORT = 75,
MTFTP_CLIENT_PORT = 76,
/* IP port for the TFTP server */
TFTP_SERVER_PORT = 69
};
enum
{
TFTP_DEFAULTSIZE_PACKET = 512,
};
enum
{
TFTP_CODE_EOF = 1,
TFTP_CODE_MORE = 2,
TFTP_CODE_ERROR = 3,
TFTP_CODE_BOOT = 4,
TFTP_CODE_CFG = 5
};
enum
{
TFTP_RRQ = 1,
TFTP_WRQ = 2,
TFTP_DATA = 3,
TFTP_ACK = 4,
TFTP_ERROR = 5,
TFTP_OACK = 6
};
enum
{
TFTP_EUNDEF = 0, /* not defined */
TFTP_ENOTFOUND = 1, /* file not found */
TFTP_EACCESS = 2, /* access violation */
TFTP_ENOSPACE = 3, /* disk full or allocation exceeded */
TFTP_EBADOP = 4, /* illegal TFTP operation */
TFTP_EBADID = 5, /* unknown transfer ID */
TFTP_EEXISTS = 6, /* file already exists */
TFTP_ENOUSER = 7 /* no such user */
};
struct tftphdr {
grub_uint16_t opcode;
union {
grub_int8_t rrq[TFTP_DEFAULTSIZE_PACKET];
struct {
grub_uint16_t block;
grub_int8_t download[0];
} data;
struct {
grub_uint16_t block;
} ack;
struct {
grub_uint16_t errcode;
grub_int8_t errmsg[TFTP_DEFAULTSIZE_PACKET];
} err;
struct {
grub_int8_t data[TFTP_DEFAULTSIZE_PACKET+2];
} oack;
} u;
} __attribute__ ((packed)) ;
typedef struct tftp_data
{
grub_uint64_t file_size;
grub_uint64_t block;
grub_uint32_t block_size;
grub_uint64_t ack_sent;
int have_oack;
struct grub_error_saved save_err;
grub_net_udp_socket_t sock;
grub_priority_queue_t pq;
} *tftp_data_t;
static int
cmp_block (grub_uint16_t a, grub_uint16_t b)
{
grub_int16_t i = (grub_int16_t) (a - b);
if (i > 0)
return +1;
if (i < 0)
return -1;
return 0;
}
static int
cmp (const void *a__, const void *b__)
{
struct grub_net_buff *a_ = *(struct grub_net_buff **) a__;
struct grub_net_buff *b_ = *(struct grub_net_buff **) b__;
struct tftphdr *a = (struct tftphdr *) a_->data;
struct tftphdr *b = (struct tftphdr *) b_->data;
/* We want the first elements to be on top. */
return -cmp_block (grub_be_to_cpu16 (a->u.data.block), grub_be_to_cpu16 (b->u.data.block));
}
static grub_err_t
ack (tftp_data_t data, grub_uint64_t block)
{
struct tftphdr *tftph_ack;
grub_uint8_t nbdata[512];
struct grub_net_buff nb_ack;
grub_err_t err;
nb_ack.head = nbdata;
nb_ack.end = nbdata + sizeof (nbdata);
grub_netbuff_clear (&nb_ack);
grub_netbuff_reserve (&nb_ack, 512);
err = grub_netbuff_push (&nb_ack, sizeof (tftph_ack->opcode)
+ sizeof (tftph_ack->u.ack.block));
if (err)
return err;
tftph_ack = (struct tftphdr *) nb_ack.data;
tftph_ack->opcode = grub_cpu_to_be16 (TFTP_ACK);
tftph_ack->u.ack.block = grub_cpu_to_be16 (block);
err = grub_net_send_udp_packet (data->sock, &nb_ack);
if (err)
return err;
data->ack_sent = block;
return GRUB_ERR_NONE;
}
static grub_err_t
tftp_receive (grub_net_udp_socket_t sock __attribute__ ((unused)),
struct grub_net_buff *nb,
void *f)
{
grub_file_t file = f;
struct tftphdr *tftph = (void *) nb->data;
tftp_data_t data = file->data;
grub_err_t err;
grub_uint8_t *ptr;
if (nb->tail - nb->data < (grub_ssize_t) sizeof (tftph->opcode))
{
grub_dprintf ("tftp", "TFTP packet too small\n");
return GRUB_ERR_NONE;
}
tftph = (struct tftphdr *) nb->data;
switch (grub_be_to_cpu16 (tftph->opcode))
{
case TFTP_OACK:
data->block_size = TFTP_DEFAULTSIZE_PACKET;
data->have_oack = 1;
for (ptr = nb->data + sizeof (tftph->opcode); ptr < nb->tail;)
{
if (grub_memcmp (ptr, "tsize\0", sizeof ("tsize\0") - 1) == 0)
data->file_size = grub_strtoul ((char *) ptr + sizeof ("tsize\0")
- 1, 0, 0);
if (grub_memcmp (ptr, "blksize\0", sizeof ("blksize\0") - 1) == 0)
data->block_size = grub_strtoul ((char *) ptr + sizeof ("blksize\0")
- 1, 0, 0);
while (ptr < nb->tail && *ptr)
ptr++;
ptr++;
}
data->block = 0;
grub_netbuff_free (nb);
err = ack (data, 0);
grub_error_save (&data->save_err);
return GRUB_ERR_NONE;
case TFTP_DATA:
if (nb->tail - nb->data < (grub_ssize_t) (sizeof (tftph->opcode)
+ sizeof (tftph->u.data.block)))
{
grub_dprintf ("tftp", "TFTP packet too small\n");
return GRUB_ERR_NONE;
}
err = grub_priority_queue_push (data->pq, &nb);
if (err)
return err;
{
struct grub_net_buff **nb_top_p, *nb_top;
while (1)
{
nb_top_p = grub_priority_queue_top (data->pq);
if (!nb_top_p)
return GRUB_ERR_NONE;
nb_top = *nb_top_p;
tftph = (struct tftphdr *) nb_top->data;
if (cmp_block (grub_be_to_cpu16 (tftph->u.data.block), data->block + 1) >= 0)
break;
ack (data, grub_be_to_cpu16 (tftph->u.data.block));
grub_netbuff_free (nb_top);
grub_priority_queue_pop (data->pq);
}
while (cmp_block (grub_be_to_cpu16 (tftph->u.data.block), data->block + 1) == 0)
{
unsigned size;
grub_priority_queue_pop (data->pq);
if (file->device->net->packs.count < 50)
err = ack (data, data->block + 1);
else
{
file->device->net->stall = 1;
err = 0;
}
if (err)
return err;
err = grub_netbuff_pull (nb_top, sizeof (tftph->opcode) +
sizeof (tftph->u.data.block));
if (err)
return err;
size = nb_top->tail - nb_top->data;
data->block++;
if (size < data->block_size)
{
if (data->ack_sent < data->block)
ack (data, data->block);
file->device->net->eof = 1;
file->device->net->stall = 1;
grub_net_udp_close (data->sock);
data->sock = NULL;
}
/* Prevent garbage in broken cards. Is it still necessary
given that IP implementation has been fixed?
*/
if (size > data->block_size)
{
err = grub_netbuff_unput (nb_top, size - data->block_size);
if (err)
return err;
}
/* If there is data, puts packet in socket list. */
if ((nb_top->tail - nb_top->data) > 0)
grub_net_put_packet (&file->device->net->packs, nb_top);
else
grub_netbuff_free (nb_top);
}
}
return GRUB_ERR_NONE;
case TFTP_ERROR:
data->have_oack = 1;
grub_netbuff_free (nb);
grub_error (GRUB_ERR_IO, (char *) tftph->u.err.errmsg);
grub_error_save (&data->save_err);
return GRUB_ERR_NONE;
default:
grub_netbuff_free (nb);
return GRUB_ERR_NONE;
}
}
static void
destroy_pq (tftp_data_t data)
{
struct grub_net_buff **nb_p;
while ((nb_p = grub_priority_queue_top (data->pq)))
{
grub_netbuff_free (*nb_p);
grub_priority_queue_pop (data->pq);
}
grub_priority_queue_destroy (data->pq);
}
static grub_err_t
tftp_open (struct grub_file *file, const char *filename)
{
struct tftphdr *tftph;
char *rrq;
int i;
int rrqlen;
int hdrlen;
grub_uint8_t open_data[1500];
struct grub_net_buff nb;
tftp_data_t data;
grub_err_t err;
grub_uint8_t *nbd;
grub_net_network_level_address_t addr;
data = grub_zalloc (sizeof (*data));
if (!data)
return grub_errno;
nb.head = open_data;
nb.end = open_data + sizeof (open_data);
grub_netbuff_clear (&nb);
grub_netbuff_reserve (&nb, 1500);
err = grub_netbuff_push (&nb, sizeof (*tftph));
if (err)
return err;
tftph = (struct tftphdr *) nb.data;
rrq = (char *) tftph->u.rrq;
rrqlen = 0;
tftph->opcode = grub_cpu_to_be16 (TFTP_RRQ);
grub_strcpy (rrq, filename);
rrqlen += grub_strlen (filename) + 1;
rrq += grub_strlen (filename) + 1;
grub_strcpy (rrq, "octet");
rrqlen += grub_strlen ("octet") + 1;
rrq += grub_strlen ("octet") + 1;
grub_strcpy (rrq, "blksize");
rrqlen += grub_strlen ("blksize") + 1;
rrq += grub_strlen ("blksize") + 1;
grub_strcpy (rrq, "1024");
rrqlen += grub_strlen ("1024") + 1;
rrq += grub_strlen ("1024") + 1;
grub_strcpy (rrq, "tsize");
rrqlen += grub_strlen ("tsize") + 1;
rrq += grub_strlen ("tsize") + 1;
grub_strcpy (rrq, "0");
rrqlen += grub_strlen ("0") + 1;
rrq += grub_strlen ("0") + 1;
hdrlen = sizeof (tftph->opcode) + rrqlen;
err = grub_netbuff_unput (&nb, nb.tail - (nb.data + hdrlen));
if (err)
return err;
file->not_easily_seekable = 1;
file->data = data;
data->pq = grub_priority_queue_new (sizeof (struct grub_net_buff *), cmp);
if (!data->pq)
return grub_errno;
err = grub_net_resolve_address (file->device->net->server, &addr);
if (err)
{
destroy_pq (data);
return err;
}
data->sock = grub_net_udp_open (addr,
TFTP_SERVER_PORT, tftp_receive,
file);
if (!data->sock)
{
destroy_pq (data);
return grub_errno;
}
/* Receive OACK packet. */
nbd = nb.data;
for (i = 0; i < GRUB_NET_TRIES; i++)
{
nb.data = nbd;
err = grub_net_send_udp_packet (data->sock, &nb);
if (err)
{
grub_net_udp_close (data->sock);
destroy_pq (data);
return err;
}
grub_net_poll_cards (GRUB_NET_INTERVAL, &data->have_oack);
if (data->have_oack)
break;
}
if (!data->have_oack)
grub_error (GRUB_ERR_TIMEOUT, N_("time out opening `%s'"), filename);
else
grub_error_load (&data->save_err);
if (grub_errno)
{
grub_net_udp_close (data->sock);
destroy_pq (data);
return grub_errno;
}
file->size = data->file_size;
return GRUB_ERR_NONE;
}
static grub_err_t
tftp_close (struct grub_file *file)
{
tftp_data_t data = file->data;
if (data->sock)
{
grub_uint8_t nbdata[512];
grub_err_t err;
struct grub_net_buff nb_err;
struct tftphdr *tftph;
nb_err.head = nbdata;
nb_err.end = nbdata + sizeof (nbdata);
grub_netbuff_clear (&nb_err);
grub_netbuff_reserve (&nb_err, 512);
err = grub_netbuff_push (&nb_err, sizeof (tftph->opcode)
+ sizeof (tftph->u.err.errcode)
+ sizeof ("closed"));
if (!err)
{
tftph = (struct tftphdr *) nb_err.data;
tftph->opcode = grub_cpu_to_be16 (TFTP_ERROR);
tftph->u.err.errcode = grub_cpu_to_be16 (TFTP_EUNDEF);
grub_memcpy (tftph->u.err.errmsg, "closed", sizeof ("closed"));
err = grub_net_send_udp_packet (data->sock, &nb_err);
}
if (err)
grub_print_error ();
grub_net_udp_close (data->sock);
}
destroy_pq (data);
grub_free (data);
return GRUB_ERR_NONE;
}
static grub_err_t
tftp_packets_pulled (struct grub_file *file)
{
tftp_data_t data = file->data;
if (file->device->net->packs.count >= 50)
return 0;
if (!file->device->net->eof)
file->device->net->stall = 0;
if (data->ack_sent >= data->block)
return 0;
return ack (data, data->block);
}
static struct grub_net_app_protocol grub_tftp_protocol =
{
.name = "tftp",
.open = tftp_open,
.close = tftp_close,
.packets_pulled = tftp_packets_pulled
};
GRUB_MOD_INIT (tftp)
{
grub_net_app_level_register (&grub_tftp_protocol);
}
GRUB_MOD_FINI (tftp)
{
grub_net_app_level_unregister (&grub_tftp_protocol);
}
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