u-boot/cmd/pxe.c
Simon Glass d50244e9d8 pxe: Allow calling the pxe_get logic directly
Refactor this code so that we can call the 'pxe get' command without going
through the command-line interpreter. This makes it easier to get the
information we need, without going through environment variables.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Artem Lapkin <email2tema@gmail.com>
Tested-by: Artem Lapkin <email2tema@gmail.com>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
2021-11-11 19:02:43 -05:00

289 lines
6.1 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2010-2011 Calxeda, Inc.
* Copyright (c) 2014, NVIDIA CORPORATION. All rights reserved.
*/
#include <common.h>
#include <command.h>
#include <fs.h>
#include <net.h>
#include "pxe_utils.h"
#ifdef CONFIG_CMD_NET
const char *pxe_default_paths[] = {
#ifdef CONFIG_SYS_SOC
#ifdef CONFIG_SYS_BOARD
"default-" CONFIG_SYS_ARCH "-" CONFIG_SYS_SOC "-" CONFIG_SYS_BOARD,
#endif
"default-" CONFIG_SYS_ARCH "-" CONFIG_SYS_SOC,
#endif
"default-" CONFIG_SYS_ARCH,
"default",
NULL
};
static int do_get_tftp(struct pxe_context *ctx, const char *file_path,
char *file_addr, ulong *sizep)
{
char *tftp_argv[] = {"tftp", NULL, NULL, NULL};
int ret;
tftp_argv[1] = file_addr;
tftp_argv[2] = (void *)file_path;
if (do_tftpb(ctx->cmdtp, 0, 3, tftp_argv))
return -ENOENT;
ret = pxe_get_file_size(sizep);
if (ret)
return log_msg_ret("tftp", ret);
ctx->pxe_file_size = *sizep;
return 1;
}
/*
* Looks for a pxe file with a name based on the pxeuuid environment variable.
*
* Returns 1 on success or < 0 on error.
*/
static int pxe_uuid_path(struct pxe_context *ctx, unsigned long pxefile_addr_r)
{
char *uuid_str;
uuid_str = from_env("pxeuuid");
if (!uuid_str)
return -ENOENT;
return get_pxelinux_path(ctx, uuid_str, pxefile_addr_r);
}
/*
* Looks for a pxe file with a name based on the 'ethaddr' environment
* variable.
*
* Returns 1 on success or < 0 on error.
*/
static int pxe_mac_path(struct pxe_context *ctx, unsigned long pxefile_addr_r)
{
char mac_str[21];
int err;
err = format_mac_pxe(mac_str, sizeof(mac_str));
if (err < 0)
return err;
return get_pxelinux_path(ctx, mac_str, pxefile_addr_r);
}
/*
* Looks for pxe files with names based on our IP address. See pxelinux
* documentation for details on what these file names look like. We match
* that exactly.
*
* Returns 1 on success or < 0 on error.
*/
static int pxe_ipaddr_paths(struct pxe_context *ctx, unsigned long pxefile_addr_r)
{
char ip_addr[9];
int mask_pos, err;
sprintf(ip_addr, "%08X", ntohl(net_ip.s_addr));
for (mask_pos = 7; mask_pos >= 0; mask_pos--) {
err = get_pxelinux_path(ctx, ip_addr, pxefile_addr_r);
if (err > 0)
return err;
ip_addr[mask_pos] = '\0';
}
return -ENOENT;
}
int pxe_get(ulong pxefile_addr_r, char **bootdirp, ulong *sizep)
{
struct cmd_tbl cmdtp[] = {}; /* dummy */
struct pxe_context ctx;
int i;
if (pxe_setup_ctx(&ctx, cmdtp, do_get_tftp, NULL, false,
env_get("bootfile")))
return -ENOMEM;
/*
* Keep trying paths until we successfully get a file we're looking
* for.
*/
if (pxe_uuid_path(&ctx, pxefile_addr_r) > 0 ||
pxe_mac_path(&ctx, pxefile_addr_r) > 0 ||
pxe_ipaddr_paths(&ctx, pxefile_addr_r) > 0)
goto done;
i = 0;
while (pxe_default_paths[i]) {
if (get_pxelinux_path(&ctx, pxe_default_paths[i],
pxefile_addr_r) > 0)
goto done;
i++;
}
pxe_destroy_ctx(&ctx);
return -ENOENT;
done:
*bootdirp = env_get("bootfile");
/*
* The PXE file size is returned but not the name. It is probably not
* that useful.
*/
*sizep = ctx.pxe_file_size;
pxe_destroy_ctx(&ctx);
return 0;
}
/*
* Entry point for the 'pxe get' command.
* This Follows pxelinux's rules to download a config file from a tftp server.
* The file is stored at the location given by the pxefile_addr_r environment
* variable, which must be set.
*
* UUID comes from pxeuuid env variable, if defined
* MAC addr comes from ethaddr env variable, if defined
* IP
*
* see http://syslinux.zytor.com/wiki/index.php/PXELINUX
*
* Returns 0 on success or 1 on error.
*/
static int
do_pxe_get(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
{
char *pxefile_addr_str;
ulong pxefile_addr_r;
char *fname;
ulong size;
int ret;
if (argc != 1)
return CMD_RET_USAGE;
pxefile_addr_str = from_env("pxefile_addr_r");
if (!pxefile_addr_str)
return 1;
ret = strict_strtoul(pxefile_addr_str, 16,
(unsigned long *)&pxefile_addr_r);
if (ret < 0)
return 1;
ret = pxe_get(pxefile_addr_r, &fname, &size);
switch (ret) {
case 0:
printf("Config file '%s' found\n", fname);
break;
case -ENOMEM:
printf("Out of memory\n");
return CMD_RET_FAILURE;
default:
printf("Config file not found\n");
return CMD_RET_FAILURE;
}
return 0;
}
/*
* Boots a system using a pxe file
*
* Returns 0 on success, 1 on error.
*/
static int
do_pxe_boot(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
{
unsigned long pxefile_addr_r;
char *pxefile_addr_str;
struct pxe_context ctx;
int ret;
if (argc == 1) {
pxefile_addr_str = from_env("pxefile_addr_r");
if (!pxefile_addr_str)
return 1;
} else if (argc == 2) {
pxefile_addr_str = argv[1];
} else {
return CMD_RET_USAGE;
}
if (strict_strtoul(pxefile_addr_str, 16, &pxefile_addr_r) < 0) {
printf("Invalid pxefile address: %s\n", pxefile_addr_str);
return 1;
}
if (pxe_setup_ctx(&ctx, cmdtp, do_get_tftp, NULL, false,
env_get("bootfile"))) {
printf("Out of memory\n");
return CMD_RET_FAILURE;
}
ret = pxe_process(&ctx, pxefile_addr_r, false);
pxe_destroy_ctx(&ctx);
if (ret)
return CMD_RET_FAILURE;
copy_filename(net_boot_file_name, "", sizeof(net_boot_file_name));
return 0;
}
static struct cmd_tbl cmd_pxe_sub[] = {
U_BOOT_CMD_MKENT(get, 1, 1, do_pxe_get, "", ""),
U_BOOT_CMD_MKENT(boot, 2, 1, do_pxe_boot, "", "")
};
static void __maybe_unused pxe_reloc(void)
{
static int relocated_pxe;
if (!relocated_pxe) {
fixup_cmdtable(cmd_pxe_sub, ARRAY_SIZE(cmd_pxe_sub));
relocated_pxe = 1;
}
}
static int do_pxe(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
{
struct cmd_tbl *cp;
#if defined(CONFIG_NEEDS_MANUAL_RELOC)
pxe_reloc();
#endif
if (argc < 2)
return CMD_RET_USAGE;
/* drop initial "pxe" arg */
argc--;
argv++;
cp = find_cmd_tbl(argv[0], cmd_pxe_sub, ARRAY_SIZE(cmd_pxe_sub));
if (cp)
return cp->cmd(cmdtp, flag, argc, argv);
return CMD_RET_USAGE;
}
U_BOOT_CMD(pxe, 3, 1, do_pxe,
"commands to get and boot from pxe files",
"get - try to retrieve a pxe file using tftp\n"
"pxe boot [pxefile_addr_r] - boot from the pxe file at pxefile_addr_r\n"
);
#endif