// SPDX-License-Identifier: GPL-2.0+ /* * Copyright 2010-2011 Calxeda, Inc. * Copyright (c) 2014, NVIDIA CORPORATION. All rights reserved. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef CONFIG_DM_RNG #include #endif #include #include #include "menu.h" #include "cli.h" #include "pxe_utils.h" #define MAX_TFTP_PATH_LEN 512 int pxe_get_file_size(ulong *sizep) { const char *val; val = from_env("filesize"); if (!val) return -ENOENT; if (strict_strtoul(val, 16, sizep) < 0) return -EINVAL; return 0; } /** * format_mac_pxe() - obtain a MAC address in the PXE format * * This produces a MAC-address string in the format for the current ethernet * device: * * 01-aa-bb-cc-dd-ee-ff * * where aa-ff is the MAC address in hex * * @outbuf: Buffer to write string to * @outbuf_len: length of buffer * Return: 1 if OK, -ENOSPC if buffer is too small, -ENOENT is there is no * current ethernet device */ 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 -ENOSPC; } if (!eth_env_get_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; } /** * get_relfile() - read a file relative to the PXE file * * 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. * * @ctx: PXE context * @file_path: File path to read (relative to the PXE file) * @file_addr: Address to load file to * @filesizep: If not NULL, returns the file size in bytes * Returns 1 for success, or < 0 on error */ static int get_relfile(struct pxe_context *ctx, const char *file_path, unsigned long file_addr, ulong *filesizep) { size_t path_len; char relfile[MAX_TFTP_PATH_LEN + 1]; char addr_buf[18]; ulong size; int ret; if (file_path[0] == '/' && ctx->allow_abs_path) *relfile = '\0'; else strncpy(relfile, ctx->bootdir, MAX_TFTP_PATH_LEN); path_len = strlen(file_path) + 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); ret = ctx->getfile(ctx, relfile, addr_buf, &size); if (ret < 0) return log_msg_ret("get", ret); if (filesizep) *filesizep = size; return 1; } /** * get_pxe_file() - read a file * * The file is read and nul-terminated * * @ctx: PXE context * @file_path: File path to read (relative to the PXE file) * @file_addr: Address to load file to * Returns 1 for success, or < 0 on error */ int get_pxe_file(struct pxe_context *ctx, const char *file_path, ulong file_addr) { ulong size; int err; char *buf; err = get_relfile(ctx, file_path, file_addr, &size); if (err < 0) return err; buf = map_sysmem(file_addr + size, 1); *buf = '\0'; unmap_sysmem(buf); return 1; } #define PXELINUX_DIR "pxelinux.cfg/" /** * get_pxelinux_path() - Get a file in the pxelinux.cfg/ directory * * @ctx: PXE context * @file: Filename to process (relative to pxelinux.cfg/) * Returns 1 for success, -ENAMETOOLONG if the resulting path is too long. * or other value < 0 on other error */ int get_pxelinux_path(struct pxe_context *ctx, 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(ctx, path, pxefile_addr_r); } /** * get_relfile_envaddr() - read a file to an address in an env var * * 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. * * @ctx: PXE context * @file_path: File path to read (relative to the PXE file) * @envaddr_name: Name of environment variable which contains the address to * load to * @filesizep: Returns the file size in bytes * Returns 1 on success, -ENOENT if @envaddr_name does not exist as an * environment variable, -EINVAL if its format is not valid hex, or other * value < 0 on other error */ static int get_relfile_envaddr(struct pxe_context *ctx, const char *file_path, const char *envaddr_name, ulong *filesizep) { 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(ctx, file_path, file_addr, filesizep); } /** * label_create() - crate a new PXE label * * Allocates memory for and initializes a pxe_label. This uses malloc, so the * result must be free()'d to reclaim the memory. * * Returns a pointer to the label, or NULL if out of memory */ 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; } /** * label_destroy() - free the memory used by a pxe_label * * This frees @label itself as well as memory used by its name, * kernel, config, append, initrd, fdt, fdtdir and fdtoverlay 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. * * @label: Label to free */ static void label_destroy(struct pxe_label *label) { free(label->name); free(label->kernel_label); free(label->kernel); free(label->config); free(label->append); free(label->initrd); free(label->fdt); free(label->fdtdir); free(label->fdtoverlays); free(label); } /** * label_print() - 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. * * @data: Label to print (is cast to struct pxe_label *) */ 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); } /** * label_localboot() - Boot a label that specified 'localboot' * * This requires that the 'localcmd' environment variable is defined. Its * contents will be executed as U-Boot commands. 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'. * * @label: Label to process * 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, sizeof(bootargs)); env_set("bootargs", bootargs); } debug("running: %s\n", localcmd); return run_command_list(localcmd, strlen(localcmd), 0); } /* * label_boot_kaslrseed generate kaslrseed from hw rng */ static void label_boot_kaslrseed(void) { #ifdef CONFIG_DM_RNG ulong fdt_addr; struct fdt_header *working_fdt; size_t n = 0x8; struct udevice *dev; u64 *buf; int nodeoffset; int err; /* Get the main fdt and map it */ fdt_addr = hextoul(env_get("fdt_addr_r"), NULL); working_fdt = map_sysmem(fdt_addr, 0); err = fdt_check_header(working_fdt); if (err) return; /* add extra size for holding kaslr-seed */ /* err is new fdt size, 0 or negtive */ err = fdt_shrink_to_minimum(working_fdt, 512); if (err <= 0) return; if (uclass_get_device(UCLASS_RNG, 0, &dev) || !dev) { printf("No RNG device\n"); return; } nodeoffset = fdt_find_or_add_subnode(working_fdt, 0, "chosen"); if (nodeoffset < 0) { printf("Reading chosen node failed\n"); return; } buf = malloc(n); if (!buf) { printf("Out of memory\n"); return; } if (dm_rng_read(dev, buf, n)) { printf("Reading RNG failed\n"); goto err; } err = fdt_setprop(working_fdt, nodeoffset, "kaslr-seed", buf, sizeof(buf)); if (err < 0) { printf("Unable to set kaslr-seed on chosen node: %s\n", fdt_strerror(err)); goto err; } err: free(buf); #endif return; } /** * label_boot_fdtoverlay() - Loads fdt overlays specified in 'fdtoverlays' * or 'devicetree-overlay' * * @ctx: PXE context * @label: Label to process */ #ifdef CONFIG_OF_LIBFDT_OVERLAY static void label_boot_fdtoverlay(struct pxe_context *ctx, struct pxe_label *label) { char *fdtoverlay = label->fdtoverlays; struct fdt_header *working_fdt; char *fdtoverlay_addr_env; ulong fdtoverlay_addr; ulong fdt_addr; int err; /* Get the main fdt and map it */ fdt_addr = hextoul(env_get("fdt_addr_r"), NULL); working_fdt = map_sysmem(fdt_addr, 0); err = fdt_check_header(working_fdt); if (err) return; /* Get the specific overlay loading address */ fdtoverlay_addr_env = env_get("fdtoverlay_addr_r"); if (!fdtoverlay_addr_env) { printf("Invalid fdtoverlay_addr_r for loading overlays\n"); return; } fdtoverlay_addr = hextoul(fdtoverlay_addr_env, NULL); /* Cycle over the overlay files and apply them in order */ do { struct fdt_header *blob; char *overlayfile; char *end; int len; /* Drop leading spaces */ while (*fdtoverlay == ' ') ++fdtoverlay; /* Copy a single filename if multiple provided */ end = strstr(fdtoverlay, " "); if (end) { len = (int)(end - fdtoverlay); overlayfile = malloc(len + 1); strncpy(overlayfile, fdtoverlay, len); overlayfile[len] = '\0'; } else overlayfile = fdtoverlay; if (!strlen(overlayfile)) goto skip_overlay; /* Load overlay file */ err = get_relfile_envaddr(ctx, overlayfile, "fdtoverlay_addr_r", NULL); if (err < 0) { printf("Failed loading overlay %s\n", overlayfile); goto skip_overlay; } /* Resize main fdt */ fdt_shrink_to_minimum(working_fdt, 8192); blob = map_sysmem(fdtoverlay_addr, 0); err = fdt_check_header(blob); if (err) { printf("Invalid overlay %s, skipping\n", overlayfile); goto skip_overlay; } err = fdt_overlay_apply_verbose(working_fdt, blob); if (err) { printf("Failed to apply overlay %s, skipping\n", overlayfile); goto skip_overlay; } skip_overlay: if (end) free(overlayfile); } while ((fdtoverlay = strstr(fdtoverlay, " "))); } #endif /** * label_boot() - 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. * * @ctx: PXE context * @label: Label to process * Returns does not return on success, otherwise returns 0 if a localboot * label was processed, or 1 on error */ static int label_boot(struct pxe_context *ctx, struct pxe_label *label) { char *bootm_argv[] = { "bootm", NULL, NULL, NULL, NULL }; char *zboot_argv[] = { "zboot", NULL, "0", NULL, NULL }; char *kernel_addr = NULL; char *initrd_addr_str = NULL; char initrd_filesize[10]; char initrd_str[28]; char mac_str[29] = ""; char ip_str[68] = ""; char *fit_addr = NULL; int bootm_argc = 2; int zboot_argc = 3; int len = 0; ulong kernel_addr_r; void *buf; label_print(label); label->attempted = 1; if (label->localboot) { if (label->localboot_val >= 0) label_localboot(label); return 0; } if (!label->kernel) { printf("No kernel given, skipping %s\n", label->name); return 1; } if (get_relfile_envaddr(ctx, label->kernel, "kernel_addr_r", NULL) < 0) { printf("Skipping %s for failure retrieving kernel\n", label->name); return 1; } kernel_addr = env_get("kernel_addr_r"); /* for FIT, append the configuration identifier */ if (label->config) { int len = strlen(kernel_addr) + strlen(label->config) + 1; fit_addr = malloc(len); if (!fit_addr) { printf("malloc fail (FIT address)\n"); return 1; } snprintf(fit_addr, len, "%s%s", kernel_addr, label->config); kernel_addr = fit_addr; } /* For FIT, the label can be identical to kernel one */ if (label->initrd && !strcmp(label->kernel_label, label->initrd)) { initrd_addr_str = kernel_addr; } else if (label->initrd) { ulong size; if (get_relfile_envaddr(ctx, label->initrd, "ramdisk_addr_r", &size) < 0) { printf("Skipping %s for failure retrieving initrd\n", label->name); goto cleanup; } initrd_addr_str = env_get("ramdisk_addr_r"); size = snprintf(initrd_str, sizeof(initrd_str), "%s:%lx", initrd_addr_str, size); if (size >= sizeof(initrd_str)) goto cleanup; } if (label->ipappend & 0x1) { sprintf(ip_str, " ip=%s:%s:%s:%s", env_get("ipaddr"), env_get("serverip"), env_get("gatewayip"), env_get("netmask")); } if (IS_ENABLED(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'; } } 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)); goto cleanup; } if (label->append) strncpy(bootargs, label->append, sizeof(bootargs)); strcat(bootargs, ip_str); strcat(bootargs, mac_str); cli_simple_process_macros(bootargs, finalbootargs, sizeof(finalbootargs)); env_set("bootargs", finalbootargs); printf("append: %s\n", finalbootargs); } /* * fdt usage is optional: * It handles the following scenarios. * * Scenario 1: If fdt_addr_r specified and "fdt" or "fdtdir" label is * defined in pxe file, retrieve fdt blob from server. Pass fdt_addr_r to * bootm, and adjust argc appropriately. * * If retrieve fails and no exact fdt blob is specified in pxe file with * "fdt" label, try Scenario 2. * * Scenario 2: If there is an fdt_addr specified, pass it along to * bootm, and adjust argc appropriately. * * Scenario 3: If there is an fdtcontroladdr specified, pass it along to * bootm, and adjust argc appropriately. * * Scenario 4: fdt blob is not available. */ bootm_argv[3] = env_get("fdt_addr_r"); /* For FIT, the label can be identical to kernel one */ if (label->fdt && !strcmp(label->kernel_label, label->fdt)) { bootm_argv[3] = kernel_addr; /* if fdt label is defined then get fdt from server */ } else 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 = env_get("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 = env_get("soc"); f2 = "-"; f3 = env_get("board"); f4 = ".dtb"; if (!f1) { f1 = ""; f2 = ""; } if (!f3) { f2 = ""; f3 = ""; } } 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"); goto cleanup; } 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(ctx, fdtfile, "fdt_addr_r", NULL); free(fdtfilefree); if (err < 0) { bootm_argv[3] = NULL; if (label->fdt) { printf("Skipping %s for failure retrieving FDT\n", label->name); goto cleanup; } } if (label->kaslrseed) label_boot_kaslrseed(); #ifdef CONFIG_OF_LIBFDT_OVERLAY if (label->fdtoverlays) label_boot_fdtoverlay(ctx, label); #endif } else { bootm_argv[3] = NULL; } } bootm_argv[1] = kernel_addr; zboot_argv[1] = kernel_addr; if (initrd_addr_str) { bootm_argv[2] = initrd_str; bootm_argc = 3; zboot_argv[3] = initrd_addr_str; zboot_argv[4] = initrd_filesize; zboot_argc = 5; } if (!bootm_argv[3]) bootm_argv[3] = env_get("fdt_addr"); if (!bootm_argv[3]) bootm_argv[3] = env_get("fdtcontroladdr"); if (bootm_argv[3]) { if (!bootm_argv[2]) bootm_argv[2] = "-"; bootm_argc = 4; } kernel_addr_r = genimg_get_kernel_addr(kernel_addr); buf = map_sysmem(kernel_addr_r, 0); /* Try bootm for legacy and FIT format image */ if (genimg_get_format(buf) != IMAGE_FORMAT_INVALID && IS_ENABLED(CONFIG_CMD_BOOTM)) do_bootm(ctx->cmdtp, 0, bootm_argc, bootm_argv); /* Try booting an AArch64 Linux kernel image */ else if (IS_ENABLED(CONFIG_CMD_BOOTI)) do_booti(ctx->cmdtp, 0, bootm_argc, bootm_argv); /* Try booting a Image */ else if (IS_ENABLED(CONFIG_CMD_BOOTZ)) do_bootz(ctx->cmdtp, 0, bootm_argc, bootm_argv); /* Try booting an x86_64 Linux kernel image */ else if (IS_ENABLED(CONFIG_CMD_ZBOOT)) do_zboot_parent(ctx->cmdtp, 0, zboot_argc, zboot_argv, NULL); unmap_sysmem(buf); cleanup: free(fit_addr); return 1; } /** enum token_type - 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_FDTOVERLAYS, T_ONTIMEOUT, T_IPAPPEND, T_BACKGROUND, T_KASLRSEED, T_INVALID }; /** struct token - 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}, {"fdtoverlays", T_FDTOVERLAYS}, {"devicetree-overlay", T_FDTOVERLAYS}, {"ontimeout", T_ONTIMEOUT,}, {"ipappend", T_IPAPPEND,}, {"background", T_BACKGROUND,}, {"kaslrseed", T_KASLRSEED,}, {NULL, T_INVALID} }; /** * enum lex_state - lexer state * * 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. * * This is 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. * * Memory for t->val is allocated using malloc and must be free()'d to reclaim * it. * * @p: Points to a pointer to the current position in the input being processed. * Updated to point at the first character after the current token * @t: Pointers to a token to fill in * @delim: Delimiter character to look for, either newline or space * @lower: true to convert the string to lower case when storing * Returns the new value of t->val, on success, NULL if out of memory */ 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 = *p; 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; } /** * get_keyword() - Populate a keyword token with a type and value * * Updates the ->type field based on the keyword string in @val * @t: Token to populate */ 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_token() - 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: Points to a pointer to the current position in the input being processed. * 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; } /** * eol_or_eof() - Find end of line * * Increment *c until we get to the end of the current line, or EOF * * @c: Points to a pointer to the current position in the input being processed. * Updated to point at the first character after the current token */ 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(struct pxe_context *ctx, char *p, ulong 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(struct pxe_context *ctx, 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(ctx, 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(ctx, 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(struct pxe_context *ctx, 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(ctx, c, base, cfg, nest_level + 1); break; case T_BACKGROUND: err = parse_sliteral(c, &cfg->bmp); 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; } /* * Handles parsing a 'kernel' label. * expecting "filename" or "#cfg" */ static int parse_label_kernel(char **c, struct pxe_label *label) { char *s; int err; err = parse_sliteral(c, &label->kernel); if (err < 0) return err; /* copy the kernel label to compare with FDT / INITRD when FIT is used */ label->kernel_label = strdup(label->kernel); if (!label->kernel_label) return -ENOMEM; s = strstr(label->kernel, "#"); if (!s) return 1; label->config = strdup(s); if (!label->config) return -ENOMEM; *s = 0; return 1; } /* * 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_label_kernel(c, label); 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_FDTOVERLAYS: if (!label->fdtoverlays) err = parse_sliteral(c, &label->fdtoverlays); 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_KASLRSEED: label->kaslrseed = 1; 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(struct pxe_context *ctx, 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(ctx, &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(ctx, &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; } } /* */ void destroy_pxe_menu(struct pxe_menu *cfg) { struct list_head *pos, *n; struct pxe_label *label; free(cfg->title); 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); } struct pxe_menu *parse_pxefile(struct pxe_context *ctx, 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(ctx, 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; char *label_override; int err; int i = 1; char *default_num = NULL; char *override_num = NULL; /* * Create a menu and add items for all the labels. */ m = menu_create(cfg->title, DIV_ROUND_UP(cfg->timeout, 10), cfg->prompt, NULL, label_print, NULL, NULL); if (!m) return NULL; label_override = env_get("pxe_label_override"); 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; if (label_override && !strcmp(label->name, label_override)) override_num = label->num; } if (label_override) { if (override_num) default_num = override_num; else printf("Missing override pxe label: %s\n", label_override); } /* * 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(struct pxe_context *ctx, 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(ctx, label); } } void handle_pxe_menu(struct pxe_context *ctx, struct pxe_menu *cfg) { void *choice; struct menu *m; int err; if (IS_ENABLED(CONFIG_CMD_BMP)) { /* display BMP if available */ if (cfg->bmp) { if (get_relfile(ctx, cfg->bmp, image_load_addr, NULL)) { #if defined(CONFIG_VIDEO) struct udevice *dev; err = uclass_first_device_err(UCLASS_VIDEO, &dev); if (!err) video_clear(dev); #endif bmp_display(image_load_addr, BMP_ALIGN_CENTER, BMP_ALIGN_CENTER); } else { printf("Skipping background bmp %s for failure\n", cfg->bmp); } } } 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(ctx, choice); if (!err) return; } else if (err != -ENOENT) { return; } boot_unattempted_labels(ctx, cfg); } int pxe_setup_ctx(struct pxe_context *ctx, struct cmd_tbl *cmdtp, pxe_getfile_func getfile, void *userdata, bool allow_abs_path, const char *bootfile) { const char *last_slash; size_t path_len = 0; memset(ctx, '\0', sizeof(*ctx)); ctx->cmdtp = cmdtp; ctx->getfile = getfile; ctx->userdata = userdata; ctx->allow_abs_path = allow_abs_path; /* figure out the boot directory, if there is one */ if (bootfile && strlen(bootfile) >= MAX_TFTP_PATH_LEN) return -ENOSPC; ctx->bootdir = strdup(bootfile ? bootfile : ""); if (!ctx->bootdir) return -ENOMEM; if (bootfile) { last_slash = strrchr(bootfile, '/'); if (last_slash) path_len = (last_slash - bootfile) + 1; } ctx->bootdir[path_len] = '\0'; return 0; } void pxe_destroy_ctx(struct pxe_context *ctx) { free(ctx->bootdir); } int pxe_process(struct pxe_context *ctx, ulong pxefile_addr_r, bool prompt) { struct pxe_menu *cfg; cfg = parse_pxefile(ctx, pxefile_addr_r); if (!cfg) { printf("Error parsing config file\n"); return 1; } if (prompt) cfg->prompt = 1; handle_pxe_menu(ctx, cfg); destroy_pxe_menu(cfg); return 0; }