diff options
Diffstat (limited to 'cmd/cmd_pxe.c')
| -rw-r--r-- | cmd/cmd_pxe.c | 1725 |
1 files changed, 1725 insertions, 0 deletions
diff --git a/cmd/cmd_pxe.c b/cmd/cmd_pxe.c new file mode 100644 index 0000000000..080b3760de --- /dev/null +++ b/cmd/cmd_pxe.c @@ -0,0 +1,1725 @@ +/* + * Copyright 2010-2011 Calxeda, Inc. + * Copyright (c) 2014, NVIDIA CORPORATION. All rights reserved. + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <command.h> +#include <malloc.h> +#include <mapmem.h> +#include <linux/string.h> +#include <linux/ctype.h> +#include <errno.h> +#include <linux/list.h> +#include <fs.h> +#include <asm/io.h> + +#include "menu.h" +#include "cli.h" + +#define MAX_TFTP_PATH_LEN 127 + +const char *pxe_default_paths[] = { +#ifdef CONFIG_SYS_SOC + "default-" CONFIG_SYS_ARCH "-" CONFIG_SYS_SOC, +#endif + "default-" CONFIG_SYS_ARCH, + "default", + NULL +}; + +static bool is_pxe; + +/* + * Like getenv, but prints an error if envvar isn't defined in the + * environment. It always returns what getenv does, so it can be used in + * place of getenv without changing error handling otherwise. + */ +static char *from_env(const char *envvar) +{ + char *ret; + + ret = getenv(envvar); + + if (!ret) + printf("missing environment variable: %s\n", envvar); + + return ret; +} + +#ifdef CONFIG_CMD_NET +/* + * Convert an ethaddr from the environment to the format used by pxelinux + * filenames based on mac addresses. Convert's ':' to '-', and adds "01-" to + * the beginning of the ethernet address to indicate a hardware type of + * Ethernet. Also converts uppercase hex characters into lowercase, to match + * pxelinux's behavior. + * + * Returns 1 for success, -ENOENT if 'ethaddr' is undefined in the + * environment, or some other value < 0 on error. + */ +static int format_mac_pxe(char *outbuf, size_t outbuf_len) +{ + uchar ethaddr[6]; + + if (outbuf_len < 21) { + printf("outbuf is too small (%zd < 21)\n", outbuf_len); + + return -EINVAL; + } + + if (!eth_getenv_enetaddr_by_index("eth", eth_get_dev_index(), + ethaddr)) + return -ENOENT; + + sprintf(outbuf, "01-%02x-%02x-%02x-%02x-%02x-%02x", + ethaddr[0], ethaddr[1], ethaddr[2], + ethaddr[3], ethaddr[4], ethaddr[5]); + + return 1; +} +#endif + +/* + * Returns the directory the file specified in the bootfile env variable is + * in. If bootfile isn't defined in the environment, return NULL, which should + * be interpreted as "don't prepend anything to paths". + */ +static int get_bootfile_path(const char *file_path, char *bootfile_path, + size_t bootfile_path_size) +{ + char *bootfile, *last_slash; + size_t path_len = 0; + + /* Only syslinux allows absolute paths */ + if (file_path[0] == '/' && !is_pxe) + goto ret; + + bootfile = from_env("bootfile"); + + if (!bootfile) + goto ret; + + last_slash = strrchr(bootfile, '/'); + + if (last_slash == NULL) + goto ret; + + path_len = (last_slash - bootfile) + 1; + + if (bootfile_path_size < path_len) { + printf("bootfile_path too small. (%zd < %zd)\n", + bootfile_path_size, path_len); + + return -1; + } + + strncpy(bootfile_path, bootfile, path_len); + + ret: + bootfile_path[path_len] = '\0'; + + return 1; +} + +static int (*do_getfile)(cmd_tbl_t *cmdtp, const char *file_path, char *file_addr); + +#ifdef CONFIG_CMD_NET +static int do_get_tftp(cmd_tbl_t *cmdtp, const char *file_path, char *file_addr) +{ + char *tftp_argv[] = {"tftp", NULL, NULL, NULL}; + + tftp_argv[1] = file_addr; + tftp_argv[2] = (void *)file_path; + + if (do_tftpb(cmdtp, 0, 3, tftp_argv)) + return -ENOENT; + + return 1; +} +#endif + +static char *fs_argv[5]; + +static int do_get_ext2(cmd_tbl_t *cmdtp, const char *file_path, char *file_addr) +{ +#ifdef CONFIG_CMD_EXT2 + fs_argv[0] = "ext2load"; + fs_argv[3] = file_addr; + fs_argv[4] = (void *)file_path; + + if (!do_ext2load(cmdtp, 0, 5, fs_argv)) + return 1; +#endif + return -ENOENT; +} + +static int do_get_fat(cmd_tbl_t *cmdtp, const char *file_path, char *file_addr) +{ +#ifdef CONFIG_CMD_FAT + fs_argv[0] = "fatload"; + fs_argv[3] = file_addr; + fs_argv[4] = (void *)file_path; + + if (!do_fat_fsload(cmdtp, 0, 5, fs_argv)) + return 1; +#endif + return -ENOENT; +} + +static int do_get_any(cmd_tbl_t *cmdtp, const char *file_path, char *file_addr) +{ +#ifdef CONFIG_CMD_FS_GENERIC + fs_argv[0] = "load"; + fs_argv[3] = file_addr; + fs_argv[4] = (void *)file_path; + + if (!do_load(cmdtp, 0, 5, fs_argv, FS_TYPE_ANY)) + return 1; +#endif + return -ENOENT; +} + +/* + * As in pxelinux, paths to files referenced from files we retrieve are + * relative to the location of bootfile. get_relfile takes such a path and + * joins it with the bootfile path to get the full path to the target file. If + * the bootfile path is NULL, we use file_path as is. + * + * Returns 1 for success, or < 0 on error. + */ +static int get_relfile(cmd_tbl_t *cmdtp, const char *file_path, + unsigned long file_addr) +{ + size_t path_len; + char relfile[MAX_TFTP_PATH_LEN+1]; + char addr_buf[18]; + int err; + + err = get_bootfile_path(file_path, relfile, sizeof(relfile)); + + if (err < 0) + return err; + + path_len = strlen(file_path); + path_len += strlen(relfile); + + if (path_len > MAX_TFTP_PATH_LEN) { + printf("Base path too long (%s%s)\n", + relfile, + file_path); + + return -ENAMETOOLONG; + } + + strcat(relfile, file_path); + + printf("Retrieving file: %s\n", relfile); + + sprintf(addr_buf, "%lx", file_addr); + + return do_getfile(cmdtp, relfile, addr_buf); +} + +/* + * Retrieve the file at 'file_path' to the locate given by 'file_addr'. If + * 'bootfile' was specified in the environment, the path to bootfile will be + * prepended to 'file_path' and the resulting path will be used. + * + * Returns 1 on success, or < 0 for error. + */ +static int get_pxe_file(cmd_tbl_t *cmdtp, const char *file_path, + unsigned long file_addr) +{ + unsigned long config_file_size; + char *tftp_filesize; + int err; + char *buf; + + err = get_relfile(cmdtp, file_path, file_addr); + + if (err < 0) + return err; + + /* + * the file comes without a NUL byte at the end, so find out its size + * and add the NUL byte. + */ + tftp_filesize = from_env("filesize"); + + if (!tftp_filesize) + return -ENOENT; + + if (strict_strtoul(tftp_filesize, 16, &config_file_size) < 0) + return -EINVAL; + + buf = map_sysmem(file_addr + config_file_size, 1); + *buf = '\0'; + unmap_sysmem(buf); + + return 1; +} + +#ifdef CONFIG_CMD_NET + +#define PXELINUX_DIR "pxelinux.cfg/" + +/* + * Retrieves a file in the 'pxelinux.cfg' folder. Since this uses get_pxe_file + * to do the hard work, the location of the 'pxelinux.cfg' folder is generated + * from the bootfile path, as described above. + * + * Returns 1 on success or < 0 on error. + */ +static int get_pxelinux_path(cmd_tbl_t *cmdtp, const char *file, + unsigned long pxefile_addr_r) +{ + size_t base_len = strlen(PXELINUX_DIR); + char path[MAX_TFTP_PATH_LEN+1]; + + if (base_len + strlen(file) > MAX_TFTP_PATH_LEN) { + printf("path (%s%s) too long, skipping\n", + PXELINUX_DIR, file); + return -ENAMETOOLONG; + } + + sprintf(path, PXELINUX_DIR "%s", file); + + return get_pxe_file(cmdtp, path, pxefile_addr_r); +} + +/* + * 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(cmd_tbl_t *cmdtp, unsigned long pxefile_addr_r) +{ + char *uuid_str; + + uuid_str = from_env("pxeuuid"); + + if (!uuid_str) + return -ENOENT; + + return get_pxelinux_path(cmdtp, 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(cmd_tbl_t *cmdtp, 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(cmdtp, 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(cmd_tbl_t *cmdtp, 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(cmdtp, ip_addr, pxefile_addr_r); + + if (err > 0) + return err; + + ip_addr[mask_pos] = '\0'; + } + + return -ENOENT; +} + +/* + * 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(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) +{ + char *pxefile_addr_str; + unsigned long pxefile_addr_r; + int err, i = 0; + + do_getfile = do_get_tftp; + + if (argc != 1) + return CMD_RET_USAGE; + + pxefile_addr_str = from_env("pxefile_addr_r"); + + if (!pxefile_addr_str) + return 1; + + err = strict_strtoul(pxefile_addr_str, 16, + (unsigned long *)&pxefile_addr_r); + if (err < 0) + return 1; + + /* + * Keep trying paths until we successfully get a file we're looking + * for. + */ + if (pxe_uuid_path(cmdtp, pxefile_addr_r) > 0 || + pxe_mac_path(cmdtp, pxefile_addr_r) > 0 || + pxe_ipaddr_paths(cmdtp, pxefile_addr_r) > 0) { + printf("Config file found\n"); + + return 0; + } + + while (pxe_default_paths[i]) { + if (get_pxelinux_path(cmdtp, pxe_default_paths[i], + pxefile_addr_r) > 0) { + printf("Config file found\n"); + return 0; + } + i++; + } + + printf("Config file not found\n"); + + return 1; +} +#endif + +/* + * Wrapper to make it easier to store the file at file_path in the location + * specified by envaddr_name. file_path will be joined to the bootfile path, + * if any is specified. + * + * Returns 1 on success or < 0 on error. + */ +static int get_relfile_envaddr(cmd_tbl_t *cmdtp, const char *file_path, const char *envaddr_name) +{ + unsigned long file_addr; + char *envaddr; + + envaddr = from_env(envaddr_name); + + if (!envaddr) + return -ENOENT; + + if (strict_strtoul(envaddr, 16, &file_addr) < 0) + return -EINVAL; + + return get_relfile(cmdtp, file_path, file_addr); +} + +/* + * A note on the pxe file parser. + * + * We're parsing files that use syslinux grammar, which has a few quirks. + * String literals must be recognized based on context - there is no + * quoting or escaping support. There's also nothing to explicitly indicate + * when a label section completes. We deal with that by ending a label + * section whenever we see a line that doesn't include. + * + * As with the syslinux family, this same file format could be reused in the + * future for non pxe purposes. The only action it takes during parsing that + * would throw this off is handling of include files. It assumes we're using + * pxe, and does a tftp download of a file listed as an include file in the + * middle of the parsing operation. That could be handled by refactoring it to + * take a 'include file getter' function. + */ + +/* + * Describes a single label given in a pxe file. + * + * Create these with the 'label_create' function given below. + * + * name - the name of the menu as given on the 'menu label' line. + * kernel - the path to the kernel file to use for this label. + * append - kernel command line to use when booting this label + * initrd - path to the initrd to use for this label. + * attempted - 0 if we haven't tried to boot this label, 1 if we have. + * localboot - 1 if this label specified 'localboot', 0 otherwise. + * list - lets these form a list, which a pxe_menu struct will hold. + */ +struct pxe_label { + char num[4]; + char *name; + char *menu; + char *kernel; + char *append; + char *initrd; + char *fdt; + char *fdtdir; + int ipappend; + int attempted; + int localboot; + int localboot_val; + struct list_head list; +}; + +/* + * Describes a pxe menu as given via pxe files. + * + * title - the name of the menu as given by a 'menu title' line. + * default_label - the name of the default label, if any. + * timeout - time in tenths of a second to wait for a user key-press before + * booting the default label. + * prompt - if 0, don't prompt for a choice unless the timeout period is + * interrupted. If 1, always prompt for a choice regardless of + * timeout. + * labels - a list of labels defined for the menu. + */ +struct pxe_menu { + char *title; + char *default_label; + int timeout; + int prompt; + struct list_head labels; +}; + +/* + * Allocates memory for and initializes a pxe_label. This uses malloc, so the + * result must be free()'d to reclaim the memory. + * + * Returns NULL if malloc fails. + */ +static struct pxe_label *label_create(void) +{ + struct pxe_label *label; + + label = malloc(sizeof(struct pxe_label)); + + if (!label) + return NULL; + + memset(label, 0, sizeof(struct pxe_label)); + + return label; +} + +/* + * Free the memory used by a pxe_label, including that used by its name, + * kernel, append and initrd members, if they're non NULL. + * + * So - be sure to only use dynamically allocated memory for the members of + * the pxe_label struct, unless you want to clean it up first. These are + * currently only created by the pxe file parsing code. + */ +static void label_destroy(struct pxe_label *label) +{ + if (label->name) + free(label->name); + + if (label->kernel) + free(label->kernel); + + if (label->append) + free(label->append); + + if (label->initrd) + free(label->initrd); + + if (label->fdt) + free(label->fdt); + + if (label->fdtdir) + free(label->fdtdir); + + free(label); +} + +/* + * Print a label and its string members if they're defined. + * + * This is passed as a callback to the menu code for displaying each + * menu entry. + */ +static void label_print(void *data) +{ + struct pxe_label *label = data; + const char *c = label->menu ? label->menu : label->name; + + printf("%s:\t%s\n", label->num, c); +} + +/* + * Boot a label that specified 'localboot'. This requires that the 'localcmd' + * environment variable is defined. Its contents will be executed as U-boot + * command. If the label specified an 'append' line, its contents will be + * used to overwrite the contents of the 'bootargs' environment variable prior + * to running 'localcmd'. + * + * Returns 1 on success or < 0 on error. + */ +static int label_localboot(struct pxe_label *label) +{ + char *localcmd; + + localcmd = from_env("localcmd"); + + if (!localcmd) + return -ENOENT; + + if (label->append) { + char bootargs[CONFIG_SYS_CBSIZE]; + + cli_simple_process_macros(label->append, bootargs); + setenv("bootargs", bootargs); + } + + debug("running: %s\n", localcmd); + + return run_command_list(localcmd, strlen(localcmd), 0); +} + +/* + * Boot according to the contents of a pxe_label. + * + * If we can't boot for any reason, we return. A successful boot never + * returns. + * + * The kernel will be stored in the location given by the 'kernel_addr_r' + * environment variable. + * + * If the label specifies an initrd file, it will be stored in the location + * given by the 'ramdisk_addr_r' environment variable. + * + * If the label specifies an 'append' line, its contents will overwrite that + * of the 'bootargs' environment variable. + */ +static int label_boot(cmd_tbl_t *cmdtp, struct pxe_label *label) +{ + char *bootm_argv[] = { "bootm", NULL, NULL, NULL, NULL }; + char initrd_str[22]; + char mac_str[29] = ""; + char ip_str[68] = ""; + int bootm_argc = 3; + int len = 0; + ulong kernel_addr; + void *buf; + + label_print(label); + + label->attempted = 1; + + if (label->localboot) { + if (label->localboot_val >= 0) + label_localboot(label); + return 0; + } + + if (label->kernel == NULL) { + printf("No kernel given, skipping %s\n", + label->name); + return 1; + } + + if (label->initrd) { + if (get_relfile_envaddr(cmdtp, label->initrd, "ramdisk_addr_r") < 0) { + printf("Skipping %s for failure retrieving initrd\n", + label->name); + return 1; + } + + bootm_argv[2] = initrd_str; + strcpy(bootm_argv[2], getenv("ramdisk_addr_r")); + strcat(bootm_argv[2], ":"); + strcat(bootm_argv[2], getenv("filesize")); + } else { + bootm_argv[2] = "-"; + } + + if (get_relfile_envaddr(cmdtp, label->kernel, "kernel_addr_r") < 0) { + printf("Skipping %s for failure retrieving kernel\n", + label->name); + return 1; + } + + if (label->ipappend & 0x1) { + sprintf(ip_str, " ip=%s:%s:%s:%s", + getenv("ipaddr"), getenv("serverip"), + getenv("gatewayip"), getenv("netmask")); + } + +#ifdef CONFIG_CMD_NET + if (label->ipappend & 0x2) { + int err; + strcpy(mac_str, " BOOTIF="); + err = format_mac_pxe(mac_str + 8, sizeof(mac_str) - 8); + if (err < 0) + mac_str[0] = '\0'; + } +#endif + + if ((label->ipappend & 0x3) || label->append) { + char bootargs[CONFIG_SYS_CBSIZE] = ""; + char finalbootargs[CONFIG_SYS_CBSIZE]; + + if (strlen(label->append ?: "") + + strlen(ip_str) + strlen(mac_str) + 1 > sizeof(bootargs)) { + printf("bootarg overflow %zd+%zd+%zd+1 > %zd\n", + strlen(label->append ?: ""), + strlen(ip_str), strlen(mac_str), + sizeof(bootargs)); + return 1; + } + + if (label->append) + strcpy(bootargs, label->append); + strcat(bootargs, ip_str); + strcat(bootargs, mac_str); + + cli_simple_process_macros(bootargs, finalbootargs); + setenv("bootargs", finalbootargs); + printf("append: %s\n", finalbootargs); + } + + bootm_argv[1] = getenv("kernel_addr_r"); + + /* + * fdt usage is optional: + * It handles the following scenarios. All scenarios are exclusive + * + * Scenario 1: If fdt_addr_r specified and "fdt" label is defined in + * pxe file, retrieve fdt blob from server. Pass fdt_addr_r to bootm, + * and adjust argc appropriately. + * + * Scenario 2: If there is an fdt_addr specified, pass it along to + * bootm, and adjust argc appropriately. + * + * Scenario 3: fdt blob is not available. + */ + bootm_argv[3] = getenv("fdt_addr_r"); + + /* if fdt label is defined then get fdt from server */ + if (bootm_argv[3]) { + char *fdtfile = NULL; + char *fdtfilefree = NULL; + + if (label->fdt) { + fdtfile = label->fdt; + } else if (label->fdtdir) { + char *f1, *f2, *f3, *f4, *slash; + + f1 = getenv("fdtfile"); + if (f1) { + f2 = ""; + f3 = ""; + f4 = ""; + } else { + /* + * For complex cases where this code doesn't + * generate the correct filename, the board + * code should set $fdtfile during early boot, + * or the boot scripts should set $fdtfile + * before invoking "pxe" or "sysboot". + */ + f1 = getenv("soc"); + f2 = "-"; + f3 = getenv("board"); + f4 = ".dtb"; + } + + len = strlen(label->fdtdir); + if (!len) + slash = "./"; + else if (label->fdtdir[len - 1] != '/') + slash = "/"; + else + slash = ""; + + len = strlen(label->fdtdir) + strlen(slash) + + strlen(f1) + strlen(f2) + strlen(f3) + + strlen(f4) + 1; + fdtfilefree = malloc(len); + if (!fdtfilefree) { + printf("malloc fail (FDT filename)\n"); + return 1; + } + + snprintf(fdtfilefree, len, "%s%s%s%s%s%s", + label->fdtdir, slash, f1, f2, f3, f4); + fdtfile = fdtfilefree; + } + + if (fdtfile) { + int err = get_relfile_envaddr(cmdtp, fdtfile, "fdt_addr_r"); + free(fdtfilefree); + if (err < 0) { + printf("Skipping %s for failure retrieving fdt\n", + label->name); + return 1; + } + } else { + bootm_argv[3] = NULL; + } + } + + if (!bootm_argv[3]) + bootm_argv[3] = getenv("fdt_addr"); + + if (bootm_argv[3]) + bootm_argc = 4; + + kernel_addr = genimg_get_kernel_addr(bootm_argv[1]); + buf = map_sysmem(kernel_addr, 0); + /* Try bootm for legacy and FIT format image */ + if (genimg_get_format(buf) != IMAGE_FORMAT_INVALID) + do_bootm(cmdtp, 0, bootm_argc, bootm_argv); +#ifdef CONFIG_CMD_BOOTI + /* Try booting an AArch64 Linux kernel image */ + else + do_booti(cmdtp, 0, bootm_argc, bootm_argv); +#elif defined(CONFIG_CMD_BOOTZ) + /* Try booting a Image */ + else + do_bootz(cmdtp, 0, bootm_argc, bootm_argv); +#endif + unmap_sysmem(buf); + return 1; +} + +/* + * Tokens for the pxe file parser. + */ +enum token_type { + T_EOL, + T_STRING, + T_EOF, + T_MENU, + T_TITLE, + T_TIMEOUT, + T_LABEL, + T_KERNEL, + T_LINUX, + T_APPEND, + T_INITRD, + T_LOCALBOOT, + T_DEFAULT, + T_PROMPT, + T_INCLUDE, + T_FDT, + T_FDTDIR, + T_ONTIMEOUT, + T_IPAPPEND, + T_INVALID +}; + +/* + * A token - given by a value and a type. + */ +struct token { + char *val; + enum token_type type; +}; + +/* + * Keywords recognized. + */ +static const struct token keywords[] = { + {"menu", T_MENU}, + {"title", T_TITLE}, + {"timeout", T_TIMEOUT}, + {"default", T_DEFAULT}, + {"prompt", T_PROMPT}, + {"label", T_LABEL}, + {"kernel", T_KERNEL}, + {"linux", T_LINUX}, + {"localboot", T_LOCALBOOT}, + {"append", T_APPEND}, + {"initrd", T_INITRD}, + {"include", T_INCLUDE}, + {"devicetree", T_FDT}, + {"fdt", T_FDT}, + {"devicetreedir", T_FDTDIR}, + {"fdtdir", T_FDTDIR}, + {"ontimeout", T_ONTIMEOUT,}, + {"ipappend", T_IPAPPEND,}, + {NULL, T_INVALID} +}; + +/* + * Since pxe(linux) files don't have a token to identify the start of a + * literal, we have to keep track of when we're in a state where a literal is + * expected vs when we're in a state a keyword is expected. + */ +enum lex_state { + L_NORMAL = 0, + L_KEYWORD, + L_SLITERAL +}; + +/* + * get_string retrieves a string from *p and stores it as a token in + * *t. + * + * get_string used for scanning both string literals and keywords. + * + * Characters from *p are copied into t-val until a character equal to + * delim is found, or a NUL byte is reached. If delim has the special value of + * ' ', any whitespace character will be used as a delimiter. + * + * If lower is unequal to 0, uppercase characters will be converted to + * lowercase in the result. This is useful to make keywords case + * insensitive. + * + * The location of *p is updated to point to the first character after the end + * of the token - the ending delimiter. + * + * On success, the new value of t->val is returned. Memory for t->val is + * allocated using malloc and must be free()'d to reclaim it. If insufficient + * memory is available, NULL is returned. + */ +static char *get_string(char **p, struct token *t, char delim, int lower) +{ + char *b, *e; + size_t len, i; + + /* + * b and e both start at the beginning of the input stream. + * + * e is incremented until we find the ending delimiter, or a NUL byte + * is reached. Then, we take e - b to find the length of the token. + */ + b = e = *p; + + while (*e) { + if ((delim == ' ' && isspace(*e)) || delim == *e) + break; + e++; + } + + len = e - b; + + /* + * Allocate memory to hold the string, and copy it in, converting + * characters to lowercase if lower is != 0. + */ + t->val = malloc(len + 1); + if (!t->val) + return NULL; + + for (i = 0; i < len; i++, b++) { + if (lower) + t->val[i] = tolower(*b); + else + t->val[i] = *b; + } + + t->val[len] = '\0'; + + /* + * Update *p so the caller knows where to continue scanning. + */ + *p = e; + + t->type = T_STRING; + + return t->val; +} + +/* + * Populate a keyword token with a type and value. + */ +static void get_keyword(struct token *t) +{ + int i; + + for (i = 0; keywords[i].val; i++) { + if (!strcmp(t->val, keywords[i].val)) { + t->type = keywords[i].type; + break; + } + } +} + +/* + * Get the next token. We have to keep track of which state we're in to know + * if we're looking to get a string literal or a keyword. + * + * *p is updated to point at the first character after the current token. + */ +static void get_token(char **p, struct token *t, enum lex_state state) +{ + char *c = *p; + + t->type = T_INVALID; + + /* eat non EOL whitespace */ + while (isblank(*c)) + c++; + + /* + * eat comments. note that string literals can't begin with #, but + * can contain a # after their first character. + */ + if (*c == '#') { + while (*c && *c != '\n') + c++; + } + + if (*c == '\n') { + t->type = T_EOL; + c++; + } else if (*c == '\0') { + t->type = T_EOF; + c++; + } else if (state == L_SLITERAL) { + get_string(&c, t, '\n', 0); + } else if (state == L_KEYWORD) { + /* + * when we expect a keyword, we first get the next string + * token delimited by whitespace, and then check if it + * matches a keyword in our keyword list. if it does, it's + * converted to a keyword token of the appropriate type, and + * if not, it remains a string token. + */ + get_string(&c, t, ' ', 1); + get_keyword(t); + } + + *p = c; +} + +/* + * Increment *c until we get to the end of the current line, or EOF. + */ +static void eol_or_eof(char **c) +{ + while (**c && **c != '\n') + (*c)++; +} + +/* + * All of these parse_* functions share some common behavior. + * + * They finish with *c pointing after the token they parse, and return 1 on + * success, or < 0 on error. + */ + +/* + * Parse a string literal and store a pointer it at *dst. String literals + * terminate at the end of the line. + */ +static int parse_sliteral(char **c, char **dst) +{ + struct token t; + char *s = *c; + + get_token(c, &t, L_SLITERAL); + + if (t.type != T_STRING) { + printf("Expected string literal: %.*s\n", (int)(*c - s), s); + return -EINVAL; + } + + *dst = t.val; + + return 1; +} + +/* + * Parse a base 10 (unsigned) integer and store it at *dst. + */ +static int parse_integer(char **c, int *dst) +{ + struct token t; + char *s = *c; + + get_token(c, &t, L_SLITERAL); + + if (t.type != T_STRING) { + printf("Expected string: %.*s\n", (int)(*c - s), s); + return -EINVAL; + } + + *dst = simple_strtol(t.val, NULL, 10); + + free(t.val); + + return 1; +} + +static int parse_pxefile_top(cmd_tbl_t *cmdtp, char *p, unsigned long base, + struct pxe_menu *cfg, int nest_level); + +/* + * Parse an include statement, and retrieve and parse the file it mentions. + * + * base should point to a location where it's safe to store the file, and + * nest_level should indicate how many nested includes have occurred. For this + * include, nest_level has already been incremented and doesn't need to be + * incremented here. + */ +static int handle_include(cmd_tbl_t *cmdtp, char **c, unsigned long base, + struct pxe_menu *cfg, int nest_level) +{ + char *include_path; + char *s = *c; + int err; + char *buf; + int ret; + + err = parse_sliteral(c, &include_path); + + if (err < 0) { + printf("Expected include path: %.*s\n", + (int)(*c - s), s); + return err; + } + + err = get_pxe_file(cmdtp, include_path, base); + + if (err < 0) { + printf("Couldn't retrieve %s\n", include_path); + return err; + } + + buf = map_sysmem(base, 0); + ret = parse_pxefile_top(cmdtp, buf, base, cfg, nest_level); + unmap_sysmem(buf); + + return ret; +} + +/* + * Parse lines that begin with 'menu'. + * + * base and nest are provided to handle the 'menu include' case. + * + * base should point to a location where it's safe to store the included file. + * + * nest_level should be 1 when parsing the top level pxe file, 2 when parsing + * a file it includes, 3 when parsing a file included by that file, and so on. + */ +static int parse_menu(cmd_tbl_t *cmdtp, char **c, struct pxe_menu *cfg, + unsigned long base, int nest_level) +{ + struct token t; + char *s = *c; + int err = 0; + + get_token(c, &t, L_KEYWORD); + + switch (t.type) { + case T_TITLE: + err = parse_sliteral(c, &cfg->title); + + break; + + case T_INCLUDE: + err = handle_include(cmdtp, c, base, cfg, + nest_level + 1); + break; + + default: + printf("Ignoring malformed menu command: %.*s\n", + (int)(*c - s), s); + } + + if (err < 0) + return err; + + eol_or_eof(c); + + return 1; +} + +/* + * Handles parsing a 'menu line' when we're parsing a label. + */ +static int parse_label_menu(char **c, struct pxe_menu *cfg, + struct pxe_label *label) +{ + struct token t; + char *s; + + s = *c; + + get_token(c, &t, L_KEYWORD); + + switch (t.type) { + case T_DEFAULT: + if (!cfg->default_label) + cfg->default_label = strdup(label->name); + + if (!cfg->default_label) + return -ENOMEM; + + break; + case T_LABEL: + parse_sliteral(c, &label->menu); + break; + default: + printf("Ignoring malformed menu command: %.*s\n", + (int)(*c - s), s); + } + + eol_or_eof(c); + + return 0; +} + +/* + * Parses a label and adds it to the list of labels for a menu. + * + * A label ends when we either get to the end of a file, or + * get some input we otherwise don't have a handler defined + * for. + * + */ +static int parse_label(char **c, struct pxe_menu *cfg) +{ + struct token t; + int len; + char *s = *c; + struct pxe_label *label; + int err; + + label = label_create(); + if (!label) + return -ENOMEM; + + err = parse_sliteral(c, &label->name); + if (err < 0) { + printf("Expected label name: %.*s\n", (int)(*c - s), s); + label_destroy(label); + return -EINVAL; + } + + list_add_tail(&label->list, &cfg->labels); + + while (1) { + s = *c; + get_token(c, &t, L_KEYWORD); + + err = 0; + switch (t.type) { + case T_MENU: + err = parse_label_menu(c, cfg, label); + break; + + case T_KERNEL: + case T_LINUX: + err = parse_sliteral(c, &label->kernel); + break; + + case T_APPEND: + err = parse_sliteral(c, &label->append); + if (label->initrd) + break; + s = strstr(label->append, "initrd="); + if (!s) + break; + s += 7; + len = (int)(strchr(s, ' ') - s); + label->initrd = malloc(len + 1); + strncpy(label->initrd, s, len); + label->initrd[len] = '\0'; + + break; + + case T_INITRD: + if (!label->initrd) + err = parse_sliteral(c, &label->initrd); + break; + + case T_FDT: + if (!label->fdt) + err = parse_sliteral(c, &label->fdt); + break; + + case T_FDTDIR: + if (!label->fdtdir) + err = parse_sliteral(c, &label->fdtdir); + break; + + case T_LOCALBOOT: + label->localboot = 1; + err = parse_integer(c, &label->localboot_val); + break; + + case T_IPAPPEND: + err = parse_integer(c, &label->ipappend); + break; + + case T_EOL: + break; + + default: + /* + * put the token back! we don't want it - it's the end + * of a label and whatever token this is, it's + * something for the menu level context to handle. + */ + *c = s; + return 1; + } + + if (err < 0) + return err; + } +} + +/* + * This 16 comes from the limit pxelinux imposes on nested includes. + * + * There is no reason at all we couldn't do more, but some limit helps prevent + * infinite (until crash occurs) recursion if a file tries to include itself. + */ +#define MAX_NEST_LEVEL 16 + +/* + * Entry point for parsing a menu file. nest_level indicates how many times + * we've nested in includes. It will be 1 for the top level menu file. + * + * Returns 1 on success, < 0 on error. + */ +static int parse_pxefile_top(cmd_tbl_t *cmdtp, char *p, unsigned long base, + struct pxe_menu *cfg, int nest_level) +{ + struct token t; + char *s, *b, *label_name; + int err; + + b = p; + + if (nest_level > MAX_NEST_LEVEL) { + printf("Maximum nesting (%d) exceeded\n", MAX_NEST_LEVEL); + return -EMLINK; + } + + while (1) { + s = p; + + get_token(&p, &t, L_KEYWORD); + + err = 0; + switch (t.type) { + case T_MENU: + cfg->prompt = 1; + err = parse_menu(cmdtp, &p, cfg, + base + ALIGN(strlen(b) + 1, 4), + nest_level); + break; + + case T_TIMEOUT: + err = parse_integer(&p, &cfg->timeout); + break; + + case T_LABEL: + err = parse_label(&p, cfg); + break; + + case T_DEFAULT: + case T_ONTIMEOUT: + err = parse_sliteral(&p, &label_name); + + if (label_name) { + if (cfg->default_label) + free(cfg->default_label); + + cfg->default_label = label_name; + } + + break; + + case T_INCLUDE: + err = handle_include(cmdtp, &p, + base + ALIGN(strlen(b), 4), cfg, + nest_level + 1); + break; + + case T_PROMPT: + eol_or_eof(&p); + break; + + case T_EOL: + break; + + case T_EOF: + return 1; + + default: + printf("Ignoring unknown command: %.*s\n", + (int)(p - s), s); + eol_or_eof(&p); + } + + if (err < 0) + return err; + } +} + +/* + * Free the memory used by a pxe_menu and its labels. + */ +static void destroy_pxe_menu(struct pxe_menu *cfg) +{ + struct list_head *pos, *n; + struct pxe_label *label; + + if (cfg->title) + free(cfg->title); + + if (cfg->default_label) + free(cfg->default_label); + + list_for_each_safe(pos, n, &cfg->labels) { + label = list_entry(pos, struct pxe_label, list); + + label_destroy(label); + } + + free(cfg); +} + +/* + * Entry point for parsing a pxe file. This is only used for the top level + * file. + * + * Returns NULL if there is an error, otherwise, returns a pointer to a + * pxe_menu struct populated with the results of parsing the pxe file (and any + * files it includes). The resulting pxe_menu struct can be free()'d by using + * the destroy_pxe_menu() function. + */ +static struct pxe_menu *parse_pxefile(cmd_tbl_t *cmdtp, unsigned long menucfg) +{ + struct pxe_menu *cfg; + char *buf; + int r; + + cfg = malloc(sizeof(struct pxe_menu)); + + if (!cfg) + return NULL; + + memset(cfg, 0, sizeof(struct pxe_menu)); + + INIT_LIST_HEAD(&cfg->labels); + + buf = map_sysmem(menucfg, 0); + r = parse_pxefile_top(cmdtp, buf, menucfg, cfg, 1); + unmap_sysmem(buf); + + if (r < 0) { + destroy_pxe_menu(cfg); + return NULL; + } + + return cfg; +} + +/* + * Converts a pxe_menu struct into a menu struct for use with U-boot's generic + * menu code. + */ +static struct menu *pxe_menu_to_menu(struct pxe_menu *cfg) +{ + struct pxe_label *label; + struct list_head *pos; + struct menu *m; + int err; + int i = 1; + char *default_num = NULL; + + /* + * Create a menu and add items for all the labels. + */ + m = menu_create(cfg->title, cfg->timeout, cfg->prompt, label_print, + NULL, NULL); + + if (!m) + return NULL; + + list_for_each(pos, &cfg->labels) { + label = list_entry(pos, struct pxe_label, list); + + sprintf(label->num, "%d", i++); + if (menu_item_add(m, label->num, label) != 1) { + menu_destroy(m); + return NULL; + } + if (cfg->default_label && + (strcmp(label->name, cfg->default_label) == 0)) + default_num = label->num; + + } + + /* + * After we've created items for each label in the menu, set the + * menu's default label if one was specified. + */ + if (default_num) { + err = menu_default_set(m, default_num); + if (err != 1) { + if (err != -ENOENT) { + menu_destroy(m); + return NULL; + } + + printf("Missing default: %s\n", cfg->default_label); + } + } + + return m; +} + +/* + * Try to boot any labels we have yet to attempt to boot. + */ +static void boot_unattempted_labels(cmd_tbl_t *cmdtp, struct pxe_menu *cfg) +{ + struct list_head *pos; + struct pxe_label *label; + + list_for_each(pos, &cfg->labels) { + label = list_entry(pos, struct pxe_label, list); + + if (!label->attempted) + label_boot(cmdtp, label); + } +} + +/* + * Boot the system as prescribed by a pxe_menu. + * + * Use the menu system to either get the user's choice or the default, based + * on config or user input. If there is no default or user's choice, + * attempted to boot labels in the order they were given in pxe files. + * If the default or user's choice fails to boot, attempt to boot other + * labels in the order they were given in pxe files. + * + * If this function returns, there weren't any labels that successfully + * booted, or the user interrupted the menu selection via ctrl+c. + */ +static void handle_pxe_menu(cmd_tbl_t *cmdtp, struct pxe_menu *cfg) +{ + void *choice; + struct menu *m; + int err; + + m = pxe_menu_to_menu(cfg); + if (!m) + return; + + err = menu_get_choice(m, &choice); + + menu_destroy(m); + + /* + * err == 1 means we got a choice back from menu_get_choice. + * + * err == -ENOENT if the menu was setup to select the default but no + * default was set. in that case, we should continue trying to boot + * labels that haven't been attempted yet. + * + * otherwise, the user interrupted or there was some other error and + * we give up. + */ + + if (err == 1) { + err = label_boot(cmdtp, choice); + if (!err) + return; + } else if (err != -ENOENT) { + return; + } + + boot_unattempted_labels(cmdtp, cfg); +} + +#ifdef CONFIG_CMD_NET +/* + * Boots a system using a pxe file + * + * Returns 0 on success, 1 on error. + */ +static int +do_pxe_boot(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) +{ + unsigned long pxefile_addr_r; + struct pxe_menu *cfg; + char *pxefile_addr_str; + + do_getfile = do_get_tftp; + + 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; + } + + cfg = parse_pxefile(cmdtp, pxefile_addr_r); + + if (cfg == NULL) { + printf("Error parsing config file\n"); + return 1; + } + + handle_pxe_menu(cmdtp, cfg); + + destroy_pxe_menu(cfg); + + copy_filename(net_boot_file_name, "", sizeof(net_boot_file_name)); + + return 0; +} + +static cmd_tbl_t cmd_pxe_sub[] = { + U_BOOT_CMD_MKENT(get, 1, 1, do_pxe_get, "", ""), + U_BOOT_CMD_MKENT(boot, 2, 1, do_pxe_boot, "", "") +}; + +static int do_pxe(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) +{ + cmd_tbl_t *cp; + + if (argc < 2) + return CMD_RET_USAGE; + + is_pxe = true; + + /* 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\npxe " + "boot [pxefile_addr_r] - boot from the pxe file at pxefile_addr_r\n" +); +#endif + +/* + * Boots a system using a local disk syslinux/extlinux file + * + * Returns 0 on success, 1 on error. + */ +static int do_sysboot(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) +{ + unsigned long pxefile_addr_r; + struct pxe_menu *cfg; + char *pxefile_addr_str; + char *filename; + int prompt = 0; + + is_pxe = false; + + if (argc > 1 && strstr(argv[1], "-p")) { + prompt = 1; + argc--; + argv++; + } + + if (argc < 4) + return cmd_usage(cmdtp); + + if (argc < 5) { + pxefile_addr_str = from_env("pxefile_addr_r"); + if (!pxefile_addr_str) + return 1; + } else { + pxefile_addr_str = argv[4]; + } + + if (argc < 6) + filename = getenv("bootfile"); + else { + filename = argv[5]; + setenv("bootfile", filename); + } + + if (strstr(argv[3], "ext2")) + do_getfile = do_get_ext2; + else if (strstr(argv[3], "fat")) + do_getfile = do_get_fat; + else if (strstr(argv[3], "any")) + do_getfile = do_get_any; + else { + printf("Invalid filesystem: %s\n", argv[3]); + return 1; + } + fs_argv[1] = argv[1]; + fs_argv[2] = argv[2]; + + if (strict_strtoul(pxefile_addr_str, 16, &pxefile_addr_r) < 0) { + printf("Invalid pxefile address: %s\n", pxefile_addr_str); + return 1; + } + + if (get_pxe_file(cmdtp, filename, pxefile_addr_r) < 0) { + printf("Error reading config file\n"); + return 1; + } + + cfg = parse_pxefile(cmdtp, pxefile_addr_r); + + if (cfg == NULL) { + printf("Error parsing config file\n"); + return 1; + } + + if (prompt) + cfg->prompt = 1; + + handle_pxe_menu(cmdtp, cfg); + + destroy_pxe_menu(cfg); + + return 0; +} + +U_BOOT_CMD( + sysboot, 7, 1, do_sysboot, + "command to get and boot from syslinux files", + "[-p] <interface> <dev[:part]> <ext2|fat|any> [addr] [filename]\n" + " - load and parse syslinux menu file 'filename' from ext2, fat\n" + " or any filesystem on 'dev' on 'interface' to address 'addr'" +); |
