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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * (C) Copyright 2000-2010
- * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
- *
- * (C) Copyright 2008
- * Guennadi Liakhovetski, DENX Software Engineering, lg@denx.de.
- */
- #define _GNU_SOURCE
- #include <compiler.h>
- #include <env.h>
- #include <errno.h>
- #include <env_flags.h>
- #include <fcntl.h>
- #include <libgen.h>
- #include <linux/fs.h>
- #include <linux/stringify.h>
- #include <ctype.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <stddef.h>
- #include <string.h>
- #include <sys/types.h>
- #include <sys/ioctl.h>
- #include <sys/stat.h>
- #include <u-boot/crc.h>
- #include <unistd.h>
- #include <dirent.h>
- #ifdef MTD_OLD
- # include <stdint.h>
- # include <linux/mtd/mtd.h>
- #else
- # define __user /* nothing */
- # include <mtd/mtd-user.h>
- #endif
- #include <mtd/ubi-user.h>
- #include "fw_env_private.h"
- #include "fw_env.h"
- struct env_opts default_opts = {
- #ifdef CONFIG_FILE
- .config_file = CONFIG_FILE
- #endif
- };
- #define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
- #define min(x, y) ({ \
- typeof(x) _min1 = (x); \
- typeof(y) _min2 = (y); \
- (void) (&_min1 == &_min2); \
- _min1 < _min2 ? _min1 : _min2; })
- struct envdev_s {
- const char *devname; /* Device name */
- long long devoff; /* Device offset */
- ulong env_size; /* environment size */
- ulong erase_size; /* device erase size */
- ulong env_sectors; /* number of environment sectors */
- uint8_t mtd_type; /* type of the MTD device */
- int is_ubi; /* set if we use UBI volume */
- };
- static struct envdev_s envdevices[2] = {
- {
- .mtd_type = MTD_ABSENT,
- }, {
- .mtd_type = MTD_ABSENT,
- },
- };
- static int dev_current;
- #define DEVNAME(i) envdevices[(i)].devname
- #define DEVOFFSET(i) envdevices[(i)].devoff
- #define ENVSIZE(i) envdevices[(i)].env_size
- #define DEVESIZE(i) envdevices[(i)].erase_size
- #define ENVSECTORS(i) envdevices[(i)].env_sectors
- #define DEVTYPE(i) envdevices[(i)].mtd_type
- #define IS_UBI(i) envdevices[(i)].is_ubi
- #define CUR_ENVSIZE ENVSIZE(dev_current)
- static unsigned long usable_envsize;
- #define ENV_SIZE usable_envsize
- struct env_image_single {
- uint32_t crc; /* CRC32 over data bytes */
- char data[];
- };
- struct env_image_redundant {
- uint32_t crc; /* CRC32 over data bytes */
- unsigned char flags; /* active or obsolete */
- char data[];
- };
- enum flag_scheme {
- FLAG_NONE,
- FLAG_BOOLEAN,
- FLAG_INCREMENTAL,
- };
- struct environment {
- void *image;
- uint32_t *crc;
- unsigned char *flags;
- char *data;
- enum flag_scheme flag_scheme;
- };
- static struct environment environment = {
- .flag_scheme = FLAG_NONE,
- };
- static int have_redund_env;
- #define DEFAULT_ENV_INSTANCE_STATIC
- #include <env_default.h>
- #define UBI_DEV_START "/dev/ubi"
- #define UBI_SYSFS "/sys/class/ubi"
- #define UBI_VOL_NAME_PATT "ubi%d_%d"
- static int is_ubi_devname(const char *devname)
- {
- return !strncmp(devname, UBI_DEV_START, sizeof(UBI_DEV_START) - 1);
- }
- static int ubi_check_volume_sysfs_name(const char *volume_sysfs_name,
- const char *volname)
- {
- char path[256];
- FILE *file;
- char *name;
- int ret;
- strcpy(path, UBI_SYSFS "/");
- strcat(path, volume_sysfs_name);
- strcat(path, "/name");
- file = fopen(path, "r");
- if (!file)
- return -1;
- ret = fscanf(file, "%ms", &name);
- fclose(file);
- if (ret <= 0 || !name) {
- fprintf(stderr,
- "Failed to read from file %s, ret = %d, name = %s\n",
- path, ret, name);
- return -1;
- }
- if (!strcmp(name, volname)) {
- free(name);
- return 0;
- }
- free(name);
- return -1;
- }
- static int ubi_get_volnum_by_name(int devnum, const char *volname)
- {
- DIR *sysfs_ubi;
- struct dirent *dirent;
- int ret;
- int tmp_devnum;
- int volnum;
- sysfs_ubi = opendir(UBI_SYSFS);
- if (!sysfs_ubi)
- return -1;
- #ifdef DEBUG
- fprintf(stderr, "Looking for volume name \"%s\"\n", volname);
- #endif
- while (1) {
- dirent = readdir(sysfs_ubi);
- if (!dirent)
- return -1;
- ret = sscanf(dirent->d_name, UBI_VOL_NAME_PATT,
- &tmp_devnum, &volnum);
- if (ret == 2 && devnum == tmp_devnum) {
- if (ubi_check_volume_sysfs_name(dirent->d_name,
- volname) == 0)
- return volnum;
- }
- }
- return -1;
- }
- static int ubi_get_devnum_by_devname(const char *devname)
- {
- int devnum;
- int ret;
- ret = sscanf(devname + sizeof(UBI_DEV_START) - 1, "%d", &devnum);
- if (ret != 1)
- return -1;
- return devnum;
- }
- static const char *ubi_get_volume_devname(const char *devname,
- const char *volname)
- {
- char *volume_devname;
- int volnum;
- int devnum;
- int ret;
- devnum = ubi_get_devnum_by_devname(devname);
- if (devnum < 0)
- return NULL;
- volnum = ubi_get_volnum_by_name(devnum, volname);
- if (volnum < 0)
- return NULL;
- ret = asprintf(&volume_devname, "%s_%d", devname, volnum);
- if (ret < 0)
- return NULL;
- #ifdef DEBUG
- fprintf(stderr, "Found ubi volume \"%s:%s\" -> %s\n",
- devname, volname, volume_devname);
- #endif
- return volume_devname;
- }
- static void ubi_check_dev(unsigned int dev_id)
- {
- char *devname = (char *)DEVNAME(dev_id);
- char *pname;
- const char *volname = NULL;
- const char *volume_devname;
- if (!is_ubi_devname(DEVNAME(dev_id)))
- return;
- IS_UBI(dev_id) = 1;
- for (pname = devname; *pname != '\0'; pname++) {
- if (*pname == ':') {
- *pname = '\0';
- volname = pname + 1;
- break;
- }
- }
- if (volname) {
- /* Let's find real volume device name */
- volume_devname = ubi_get_volume_devname(devname, volname);
- if (!volume_devname) {
- fprintf(stderr, "Didn't found ubi volume \"%s\"\n",
- volname);
- return;
- }
- free(devname);
- DEVNAME(dev_id) = volume_devname;
- }
- }
- static int ubi_update_start(int fd, int64_t bytes)
- {
- if (ioctl(fd, UBI_IOCVOLUP, &bytes))
- return -1;
- return 0;
- }
- static int ubi_read(int fd, void *buf, size_t count)
- {
- ssize_t ret;
- while (count > 0) {
- ret = read(fd, buf, count);
- if (ret > 0) {
- count -= ret;
- buf += ret;
- continue;
- }
- if (ret == 0) {
- /*
- * Happens in case of too short volume data size. If we
- * return error status we will fail it will be treated
- * as UBI device error.
- *
- * Leave catching this error to CRC check.
- */
- fprintf(stderr, "Warning: end of data on ubi volume\n");
- return 0;
- } else if (errno == EBADF) {
- /*
- * Happens in case of corrupted volume. The same as
- * above, we cannot return error now, as we will still
- * be able to successfully write environment later.
- */
- fprintf(stderr, "Warning: corrupted volume?\n");
- return 0;
- } else if (errno == EINTR) {
- continue;
- }
- fprintf(stderr, "Cannot read %u bytes from ubi volume, %s\n",
- (unsigned int)count, strerror(errno));
- return -1;
- }
- return 0;
- }
- static int ubi_write(int fd, const void *buf, size_t count)
- {
- ssize_t ret;
- while (count > 0) {
- ret = write(fd, buf, count);
- if (ret <= 0) {
- if (ret < 0 && errno == EINTR)
- continue;
- fprintf(stderr, "Cannot write %u bytes to ubi volume\n",
- (unsigned int)count);
- return -1;
- }
- count -= ret;
- buf += ret;
- }
- return 0;
- }
- static int flash_io(int mode);
- static int parse_config(struct env_opts *opts);
- #if defined(CONFIG_FILE)
- static int get_config(char *);
- #endif
- static char *skip_chars(char *s)
- {
- for (; *s != '\0'; s++) {
- if (isblank(*s) || *s == '=')
- return s;
- }
- return NULL;
- }
- static char *skip_blanks(char *s)
- {
- for (; *s != '\0'; s++) {
- if (!isblank(*s))
- return s;
- }
- return NULL;
- }
- /*
- * s1 is either a simple 'name', or a 'name=value' pair.
- * s2 is a 'name=value' pair.
- * If the names match, return the value of s2, else NULL.
- */
- static char *envmatch(char *s1, char *s2)
- {
- if (s1 == NULL || s2 == NULL)
- return NULL;
- while (*s1 == *s2++)
- if (*s1++ == '=')
- return s2;
- if (*s1 == '\0' && *(s2 - 1) == '=')
- return s2;
- return NULL;
- }
- /**
- * Search the environment for a variable.
- * Return the value, if found, or NULL, if not found.
- */
- char *fw_getenv(char *name)
- {
- char *env, *nxt;
- for (env = environment.data; *env; env = nxt + 1) {
- char *val;
- for (nxt = env; *nxt; ++nxt) {
- if (nxt >= &environment.data[ENV_SIZE]) {
- fprintf(stderr, "## Error: "
- "environment not terminated\n");
- return NULL;
- }
- }
- val = envmatch(name, env);
- if (!val)
- continue;
- return val;
- }
- return NULL;
- }
- /*
- * Search the default environment for a variable.
- * Return the value, if found, or NULL, if not found.
- */
- char *fw_getdefenv(char *name)
- {
- char *env, *nxt;
- for (env = default_environment; *env; env = nxt + 1) {
- char *val;
- for (nxt = env; *nxt; ++nxt) {
- if (nxt >= &default_environment[ENV_SIZE]) {
- fprintf(stderr, "## Error: "
- "default environment not terminated\n");
- return NULL;
- }
- }
- val = envmatch(name, env);
- if (!val)
- continue;
- return val;
- }
- return NULL;
- }
- /*
- * Print the current definition of one, or more, or all
- * environment variables
- */
- int fw_printenv(int argc, char *argv[], int value_only, struct env_opts *opts)
- {
- int i, rc = 0;
- if (value_only && argc != 1) {
- fprintf(stderr,
- "## Error: `-n'/`--noheader' option requires exactly one argument\n");
- return -1;
- }
- if (!opts)
- opts = &default_opts;
- if (fw_env_open(opts))
- return -1;
- if (argc == 0) { /* Print all env variables */
- char *env, *nxt;
- for (env = environment.data; *env; env = nxt + 1) {
- for (nxt = env; *nxt; ++nxt) {
- if (nxt >= &environment.data[ENV_SIZE]) {
- fprintf(stderr, "## Error: "
- "environment not terminated\n");
- return -1;
- }
- }
- printf("%s\n", env);
- }
- fw_env_close(opts);
- return 0;
- }
- for (i = 0; i < argc; ++i) { /* print a subset of env variables */
- char *name = argv[i];
- char *val = NULL;
- val = fw_getenv(name);
- if (!val) {
- fprintf(stderr, "## Error: \"%s\" not defined\n", name);
- rc = -1;
- continue;
- }
- if (value_only) {
- puts(val);
- break;
- }
- printf("%s=%s\n", name, val);
- }
- fw_env_close(opts);
- return rc;
- }
- int fw_env_flush(struct env_opts *opts)
- {
- if (!opts)
- opts = &default_opts;
- /*
- * Update CRC
- */
- *environment.crc = crc32(0, (uint8_t *) environment.data, ENV_SIZE);
- /* write environment back to flash */
- if (flash_io(O_RDWR)) {
- fprintf(stderr, "Error: can't write fw_env to flash\n");
- return -1;
- }
- return 0;
- }
- /*
- * Set/Clear a single variable in the environment.
- * This is called in sequence to update the environment
- * in RAM without updating the copy in flash after each set
- */
- int fw_env_write(char *name, char *value)
- {
- int len;
- char *env, *nxt;
- char *oldval = NULL;
- int deleting, creating, overwriting;
- /*
- * search if variable with this name already exists
- */
- for (nxt = env = environment.data; *env; env = nxt + 1) {
- for (nxt = env; *nxt; ++nxt) {
- if (nxt >= &environment.data[ENV_SIZE]) {
- fprintf(stderr, "## Error: "
- "environment not terminated\n");
- errno = EINVAL;
- return -1;
- }
- }
- oldval = envmatch(name, env);
- if (oldval)
- break;
- }
- deleting = (oldval && !(value && strlen(value)));
- creating = (!oldval && (value && strlen(value)));
- overwriting = (oldval && (value && strlen(value)));
- /* check for permission */
- if (deleting) {
- if (env_flags_validate_varaccess(name,
- ENV_FLAGS_VARACCESS_PREVENT_DELETE)) {
- printf("Can't delete \"%s\"\n", name);
- errno = EROFS;
- return -1;
- }
- } else if (overwriting) {
- if (env_flags_validate_varaccess(name,
- ENV_FLAGS_VARACCESS_PREVENT_OVERWR)) {
- printf("Can't overwrite \"%s\"\n", name);
- errno = EROFS;
- return -1;
- } else if (env_flags_validate_varaccess(name,
- ENV_FLAGS_VARACCESS_PREVENT_NONDEF_OVERWR)) {
- const char *defval = fw_getdefenv(name);
- if (defval == NULL)
- defval = "";
- if (strcmp(oldval, defval)
- != 0) {
- printf("Can't overwrite \"%s\"\n", name);
- errno = EROFS;
- return -1;
- }
- }
- } else if (creating) {
- if (env_flags_validate_varaccess(name,
- ENV_FLAGS_VARACCESS_PREVENT_CREATE)) {
- printf("Can't create \"%s\"\n", name);
- errno = EROFS;
- return -1;
- }
- } else
- /* Nothing to do */
- return 0;
- if (deleting || overwriting) {
- if (*++nxt == '\0') {
- *env = '\0';
- } else {
- for (;;) {
- *env = *nxt++;
- if ((*env == '\0') && (*nxt == '\0'))
- break;
- ++env;
- }
- }
- *++env = '\0';
- }
- /* Delete only ? */
- if (!value || !strlen(value))
- return 0;
- /*
- * Append new definition at the end
- */
- for (env = environment.data; *env || *(env + 1); ++env)
- ;
- if (env > environment.data)
- ++env;
- /*
- * Overflow when:
- * "name" + "=" + "val" +"\0\0" > CUR_ENVSIZE - (env-environment)
- */
- len = strlen(name) + 2;
- /* add '=' for first arg, ' ' for all others */
- len += strlen(value) + 1;
- if (len > (&environment.data[ENV_SIZE] - env)) {
- fprintf(stderr,
- "Error: environment overflow, \"%s\" deleted\n", name);
- return -1;
- }
- while ((*env = *name++) != '\0')
- env++;
- *env = '=';
- while ((*++env = *value++) != '\0')
- ;
- /* end is marked with double '\0' */
- *++env = '\0';
- return 0;
- }
- /*
- * Deletes or sets environment variables. Returns -1 and sets errno error codes:
- * 0 - OK
- * EINVAL - need at least 1 argument
- * EROFS - certain variables ("ethaddr", "serial#") cannot be
- * modified or deleted
- *
- */
- int fw_env_set(int argc, char *argv[], struct env_opts *opts)
- {
- int i;
- size_t len;
- char *name, **valv;
- char *oldval;
- char *value = NULL;
- int valc;
- int ret;
- if (!opts)
- opts = &default_opts;
- if (argc < 1) {
- fprintf(stderr, "## Error: variable name missing\n");
- errno = EINVAL;
- return -1;
- }
- if (fw_env_open(opts)) {
- fprintf(stderr, "Error: environment not initialized\n");
- return -1;
- }
- name = argv[0];
- valv = argv + 1;
- valc = argc - 1;
- if (env_flags_validate_env_set_params(name, valv, valc) < 0) {
- fw_env_close(opts);
- return -1;
- }
- len = 0;
- for (i = 0; i < valc; ++i) {
- char *val = valv[i];
- size_t val_len = strlen(val);
- if (value)
- value[len - 1] = ' ';
- oldval = value;
- value = realloc(value, len + val_len + 1);
- if (!value) {
- fprintf(stderr,
- "Cannot malloc %zu bytes: %s\n",
- len, strerror(errno));
- free(oldval);
- return -1;
- }
- memcpy(value + len, val, val_len);
- len += val_len;
- value[len++] = '\0';
- }
- fw_env_write(name, value);
- free(value);
- ret = fw_env_flush(opts);
- fw_env_close(opts);
- return ret;
- }
- /*
- * Parse a file and configure the u-boot variables.
- * The script file has a very simple format, as follows:
- *
- * Each line has a couple with name, value:
- * <white spaces>variable_name<white spaces>variable_value
- *
- * Both variable_name and variable_value are interpreted as strings.
- * Any character after <white spaces> and before ending \r\n is interpreted
- * as variable's value (no comment allowed on these lines !)
- *
- * Comments are allowed if the first character in the line is #
- *
- * Returns -1 and sets errno error codes:
- * 0 - OK
- * -1 - Error
- */
- int fw_parse_script(char *fname, struct env_opts *opts)
- {
- FILE *fp;
- char *line = NULL;
- size_t linesize = 0;
- char *name;
- char *val;
- int lineno = 0;
- int len;
- int ret = 0;
- if (!opts)
- opts = &default_opts;
- if (fw_env_open(opts)) {
- fprintf(stderr, "Error: environment not initialized\n");
- return -1;
- }
- if (strcmp(fname, "-") == 0)
- fp = stdin;
- else {
- fp = fopen(fname, "r");
- if (fp == NULL) {
- fprintf(stderr, "I cannot open %s for reading\n",
- fname);
- return -1;
- }
- }
- while ((len = getline(&line, &linesize, fp)) != -1) {
- lineno++;
- /*
- * Read a whole line from the file. If the line is not
- * terminated, reports an error and exit.
- */
- if (line[len - 1] != '\n') {
- fprintf(stderr,
- "Line %d not correctly terminated\n",
- lineno);
- ret = -1;
- break;
- }
- /* Drop ending line feed / carriage return */
- line[--len] = '\0';
- if (len && line[len - 1] == '\r')
- line[--len] = '\0';
- /* Skip comment or empty lines */
- if (len == 0 || line[0] == '#')
- continue;
- /*
- * Search for variable's name remove leading whitespaces
- */
- name = skip_blanks(line);
- if (!name)
- continue;
- /* The first white space is the end of variable name */
- val = skip_chars(name);
- len = strlen(name);
- if (val) {
- *val++ = '\0';
- if ((val - name) < len)
- val = skip_blanks(val);
- else
- val = NULL;
- }
- #ifdef DEBUG
- fprintf(stderr, "Setting %s : %s\n",
- name, val ? val : " removed");
- #endif
- if (env_flags_validate_type(name, val) < 0) {
- ret = -1;
- break;
- }
- /*
- * If there is an error setting a variable,
- * try to save the environment and returns an error
- */
- if (fw_env_write(name, val)) {
- fprintf(stderr,
- "fw_env_write returns with error : %s\n",
- strerror(errno));
- ret = -1;
- break;
- }
- }
- free(line);
- /* Close file if not stdin */
- if (strcmp(fname, "-") != 0)
- fclose(fp);
- ret |= fw_env_flush(opts);
- fw_env_close(opts);
- return ret;
- }
- /**
- * environment_end() - compute offset of first byte right after environment
- * @dev - index of enviroment buffer
- * Return:
- * device offset of first byte right after environment
- */
- off_t environment_end(int dev)
- {
- /* environment is block aligned */
- return DEVOFFSET(dev) + ENVSECTORS(dev) * DEVESIZE(dev);
- }
- /*
- * Test for bad block on NAND, just returns 0 on NOR, on NAND:
- * 0 - block is good
- * > 0 - block is bad
- * < 0 - failed to test
- */
- static int flash_bad_block(int fd, uint8_t mtd_type, loff_t blockstart)
- {
- if (mtd_type == MTD_NANDFLASH) {
- int badblock = ioctl(fd, MEMGETBADBLOCK, &blockstart);
- if (badblock < 0) {
- perror("Cannot read bad block mark");
- return badblock;
- }
- if (badblock) {
- #ifdef DEBUG
- fprintf(stderr, "Bad block at 0x%llx, skipping\n",
- (unsigned long long)blockstart);
- #endif
- return badblock;
- }
- }
- return 0;
- }
- /*
- * Read data from flash at an offset into a provided buffer. On NAND it skips
- * bad blocks but makes sure it stays within ENVSECTORS (dev) starting from
- * the DEVOFFSET (dev) block. On NOR the loop is only run once.
- */
- static int flash_read_buf(int dev, int fd, void *buf, size_t count,
- off_t offset)
- {
- size_t blocklen; /* erase / write length - one block on NAND,
- 0 on NOR */
- size_t processed = 0; /* progress counter */
- size_t readlen = count; /* current read length */
- off_t block_seek; /* offset inside the current block to the start
- of the data */
- loff_t blockstart; /* running start of the current block -
- MEMGETBADBLOCK needs 64 bits */
- int rc;
- blockstart = (offset / DEVESIZE(dev)) * DEVESIZE(dev);
- /* Offset inside a block */
- block_seek = offset - blockstart;
- if (DEVTYPE(dev) == MTD_NANDFLASH) {
- /*
- * NAND: calculate which blocks we are reading. We have
- * to read one block at a time to skip bad blocks.
- */
- blocklen = DEVESIZE(dev);
- /* Limit to one block for the first read */
- if (readlen > blocklen - block_seek)
- readlen = blocklen - block_seek;
- } else {
- blocklen = 0;
- }
- /* This only runs once on NOR flash */
- while (processed < count) {
- rc = flash_bad_block(fd, DEVTYPE(dev), blockstart);
- if (rc < 0) /* block test failed */
- return -1;
- if (blockstart + block_seek + readlen > environment_end(dev)) {
- /* End of range is reached */
- fprintf(stderr, "Too few good blocks within range\n");
- return -1;
- }
- if (rc) { /* block is bad */
- blockstart += blocklen;
- continue;
- }
- /*
- * If a block is bad, we retry in the next block at the same
- * offset - see env/nand.c::writeenv()
- */
- lseek(fd, blockstart + block_seek, SEEK_SET);
- rc = read(fd, buf + processed, readlen);
- if (rc != readlen) {
- fprintf(stderr, "Read error on %s: %s\n",
- DEVNAME(dev), strerror(errno));
- return -1;
- }
- #ifdef DEBUG
- fprintf(stderr, "Read 0x%x bytes at 0x%llx on %s\n",
- rc, (unsigned long long)blockstart + block_seek,
- DEVNAME(dev));
- #endif
- processed += readlen;
- readlen = min(blocklen, count - processed);
- block_seek = 0;
- blockstart += blocklen;
- }
- return processed;
- }
- /*
- * Write count bytes from begin of environment, but stay within
- * ENVSECTORS(dev) sectors of
- * DEVOFFSET (dev). Similar to the read case above, on NOR and dataflash we
- * erase and write the whole data at once.
- */
- static int flash_write_buf(int dev, int fd, void *buf, size_t count)
- {
- void *data;
- struct erase_info_user erase;
- size_t blocklen; /* length of NAND block / NOR erase sector */
- size_t erase_len; /* whole area that can be erased - may include
- bad blocks */
- size_t erasesize; /* erase / write length - one block on NAND,
- whole area on NOR */
- size_t processed = 0; /* progress counter */
- size_t write_total; /* total size to actually write - excluding
- bad blocks */
- off_t erase_offset; /* offset to the first erase block (aligned)
- below offset */
- off_t block_seek; /* offset inside the erase block to the start
- of the data */
- loff_t blockstart; /* running start of the current block -
- MEMGETBADBLOCK needs 64 bits */
- int rc;
- /*
- * For mtd devices only offset and size of the environment do matter
- */
- if (DEVTYPE(dev) == MTD_ABSENT) {
- blocklen = count;
- erase_len = blocklen;
- blockstart = DEVOFFSET(dev);
- block_seek = 0;
- write_total = blocklen;
- } else {
- blocklen = DEVESIZE(dev);
- erase_offset = DEVOFFSET(dev);
- /* Maximum area we may use */
- erase_len = environment_end(dev) - erase_offset;
- blockstart = erase_offset;
- /* Offset inside a block */
- block_seek = DEVOFFSET(dev) - erase_offset;
- /*
- * Data size we actually write: from the start of the block
- * to the start of the data, then count bytes of data, and
- * to the end of the block
- */
- write_total = ((block_seek + count + blocklen - 1) /
- blocklen) * blocklen;
- }
- /*
- * Support data anywhere within erase sectors: read out the complete
- * area to be erased, replace the environment image, write the whole
- * block back again.
- */
- if (write_total > count) {
- data = malloc(erase_len);
- if (!data) {
- fprintf(stderr,
- "Cannot malloc %zu bytes: %s\n",
- erase_len, strerror(errno));
- return -1;
- }
- rc = flash_read_buf(dev, fd, data, write_total, erase_offset);
- if (write_total != rc)
- return -1;
- #ifdef DEBUG
- fprintf(stderr, "Preserving data ");
- if (block_seek != 0)
- fprintf(stderr, "0x%x - 0x%lx", 0, block_seek - 1);
- if (block_seek + count != write_total) {
- if (block_seek != 0)
- fprintf(stderr, " and ");
- fprintf(stderr, "0x%lx - 0x%lx",
- (unsigned long)block_seek + count,
- (unsigned long)write_total - 1);
- }
- fprintf(stderr, "\n");
- #endif
- /* Overwrite the old environment */
- memcpy(data + block_seek, buf, count);
- } else {
- /*
- * We get here, iff offset is block-aligned and count is a
- * multiple of blocklen - see write_total calculation above
- */
- data = buf;
- }
- if (DEVTYPE(dev) == MTD_NANDFLASH) {
- /*
- * NAND: calculate which blocks we are writing. We have
- * to write one block at a time to skip bad blocks.
- */
- erasesize = blocklen;
- } else {
- erasesize = erase_len;
- }
- erase.length = erasesize;
- /* This only runs once on NOR flash and SPI-dataflash */
- while (processed < write_total) {
- rc = flash_bad_block(fd, DEVTYPE(dev), blockstart);
- if (rc < 0) /* block test failed */
- return rc;
- if (blockstart + erasesize > environment_end(dev)) {
- fprintf(stderr, "End of range reached, aborting\n");
- return -1;
- }
- if (rc) { /* block is bad */
- blockstart += blocklen;
- continue;
- }
- if (DEVTYPE(dev) != MTD_ABSENT) {
- erase.start = blockstart;
- ioctl(fd, MEMUNLOCK, &erase);
- /* These do not need an explicit erase cycle */
- if (DEVTYPE(dev) != MTD_DATAFLASH)
- if (ioctl(fd, MEMERASE, &erase) != 0) {
- fprintf(stderr,
- "MTD erase error on %s: %s\n",
- DEVNAME(dev), strerror(errno));
- return -1;
- }
- }
- if (lseek(fd, blockstart, SEEK_SET) == -1) {
- fprintf(stderr,
- "Seek error on %s: %s\n",
- DEVNAME(dev), strerror(errno));
- return -1;
- }
- #ifdef DEBUG
- fprintf(stderr, "Write 0x%llx bytes at 0x%llx\n",
- (unsigned long long)erasesize,
- (unsigned long long)blockstart);
- #endif
- if (write(fd, data + processed, erasesize) != erasesize) {
- fprintf(stderr, "Write error on %s: %s\n",
- DEVNAME(dev), strerror(errno));
- return -1;
- }
- if (DEVTYPE(dev) != MTD_ABSENT)
- ioctl(fd, MEMLOCK, &erase);
- processed += erasesize;
- block_seek = 0;
- blockstart += erasesize;
- }
- if (write_total > count)
- free(data);
- return processed;
- }
- /*
- * Set obsolete flag at offset - NOR flash only
- */
- static int flash_flag_obsolete(int dev, int fd, off_t offset)
- {
- int rc;
- struct erase_info_user erase;
- char tmp = ENV_REDUND_OBSOLETE;
- erase.start = DEVOFFSET(dev);
- erase.length = DEVESIZE(dev);
- /* This relies on the fact, that ENV_REDUND_OBSOLETE == 0 */
- rc = lseek(fd, offset, SEEK_SET);
- if (rc < 0) {
- fprintf(stderr, "Cannot seek to set the flag on %s\n",
- DEVNAME(dev));
- return rc;
- }
- ioctl(fd, MEMUNLOCK, &erase);
- rc = write(fd, &tmp, sizeof(tmp));
- ioctl(fd, MEMLOCK, &erase);
- if (rc < 0)
- perror("Could not set obsolete flag");
- return rc;
- }
- static int flash_write(int fd_current, int fd_target, int dev_target)
- {
- int rc;
- switch (environment.flag_scheme) {
- case FLAG_NONE:
- break;
- case FLAG_INCREMENTAL:
- (*environment.flags)++;
- break;
- case FLAG_BOOLEAN:
- *environment.flags = ENV_REDUND_ACTIVE;
- break;
- default:
- fprintf(stderr, "Unimplemented flash scheme %u\n",
- environment.flag_scheme);
- return -1;
- }
- #ifdef DEBUG
- fprintf(stderr, "Writing new environment at 0x%llx on %s\n",
- DEVOFFSET(dev_target), DEVNAME(dev_target));
- #endif
- if (IS_UBI(dev_target)) {
- if (ubi_update_start(fd_target, CUR_ENVSIZE) < 0)
- return 0;
- return ubi_write(fd_target, environment.image, CUR_ENVSIZE);
- }
- rc = flash_write_buf(dev_target, fd_target, environment.image,
- CUR_ENVSIZE);
- if (rc < 0)
- return rc;
- if (environment.flag_scheme == FLAG_BOOLEAN) {
- /* Have to set obsolete flag */
- off_t offset = DEVOFFSET(dev_current) +
- offsetof(struct env_image_redundant, flags);
- #ifdef DEBUG
- fprintf(stderr,
- "Setting obsolete flag in environment at 0x%llx on %s\n",
- DEVOFFSET(dev_current), DEVNAME(dev_current));
- #endif
- flash_flag_obsolete(dev_current, fd_current, offset);
- }
- return 0;
- }
- static int flash_read(int fd)
- {
- int rc;
- if (IS_UBI(dev_current)) {
- DEVTYPE(dev_current) = MTD_ABSENT;
- return ubi_read(fd, environment.image, CUR_ENVSIZE);
- }
- rc = flash_read_buf(dev_current, fd, environment.image, CUR_ENVSIZE,
- DEVOFFSET(dev_current));
- if (rc != CUR_ENVSIZE)
- return -1;
- return 0;
- }
- static int flash_open_tempfile(const char **dname, const char **target_temp)
- {
- char *dup_name = strdup(DEVNAME(dev_current));
- char *temp_name = NULL;
- int rc = -1;
- if (!dup_name)
- return -1;
- *dname = dirname(dup_name);
- if (!*dname)
- goto err;
- rc = asprintf(&temp_name, "%s/XXXXXX", *dname);
- if (rc == -1)
- goto err;
- rc = mkstemp(temp_name);
- if (rc == -1) {
- /* fall back to in place write */
- fprintf(stderr,
- "Can't create %s: %s\n", temp_name, strerror(errno));
- free(temp_name);
- } else {
- *target_temp = temp_name;
- /* deliberately leak dup_name as dname /might/ point into
- * it and we need it for our caller
- */
- dup_name = NULL;
- }
- err:
- if (dup_name)
- free(dup_name);
- return rc;
- }
- static int flash_io_write(int fd_current)
- {
- int fd_target = -1, rc, dev_target;
- const char *dname, *target_temp = NULL;
- if (have_redund_env) {
- /* switch to next partition for writing */
- dev_target = !dev_current;
- /* dev_target: fd_target, erase_target */
- fd_target = open(DEVNAME(dev_target), O_RDWR);
- if (fd_target < 0) {
- fprintf(stderr,
- "Can't open %s: %s\n",
- DEVNAME(dev_target), strerror(errno));
- rc = -1;
- goto exit;
- }
- } else {
- struct stat sb;
- if (fstat(fd_current, &sb) == 0 && S_ISREG(sb.st_mode)) {
- /* if any part of flash_open_tempfile() fails we fall
- * back to in-place writes
- */
- fd_target = flash_open_tempfile(&dname, &target_temp);
- }
- dev_target = dev_current;
- if (fd_target == -1)
- fd_target = fd_current;
- }
- rc = flash_write(fd_current, fd_target, dev_target);
- if (fsync(fd_current) && !(errno == EINVAL || errno == EROFS)) {
- fprintf(stderr,
- "fsync failed on %s: %s\n",
- DEVNAME(dev_current), strerror(errno));
- }
- if (fd_current != fd_target) {
- if (fsync(fd_target) &&
- !(errno == EINVAL || errno == EROFS)) {
- fprintf(stderr,
- "fsync failed on %s: %s\n",
- DEVNAME(dev_current), strerror(errno));
- }
- if (close(fd_target)) {
- fprintf(stderr,
- "I/O error on %s: %s\n",
- DEVNAME(dev_target), strerror(errno));
- rc = -1;
- }
- if (rc >= 0 && target_temp) {
- int dir_fd;
- dir_fd = open(dname, O_DIRECTORY | O_RDONLY);
- if (dir_fd == -1)
- fprintf(stderr,
- "Can't open %s: %s\n",
- dname, strerror(errno));
- if (rename(target_temp, DEVNAME(dev_target))) {
- fprintf(stderr,
- "rename failed %s => %s: %s\n",
- target_temp, DEVNAME(dev_target),
- strerror(errno));
- rc = -1;
- }
- if (dir_fd != -1 && fsync(dir_fd))
- fprintf(stderr,
- "fsync failed on %s: %s\n",
- dname, strerror(errno));
- if (dir_fd != -1 && close(dir_fd))
- fprintf(stderr,
- "I/O error on %s: %s\n",
- dname, strerror(errno));
- }
- }
- exit:
- return rc;
- }
- static int flash_io(int mode)
- {
- int fd_current, rc;
- /* dev_current: fd_current, erase_current */
- fd_current = open(DEVNAME(dev_current), mode);
- if (fd_current < 0) {
- fprintf(stderr,
- "Can't open %s: %s\n",
- DEVNAME(dev_current), strerror(errno));
- return -1;
- }
- if (mode == O_RDWR) {
- rc = flash_io_write(fd_current);
- } else {
- rc = flash_read(fd_current);
- }
- if (close(fd_current)) {
- fprintf(stderr,
- "I/O error on %s: %s\n",
- DEVNAME(dev_current), strerror(errno));
- return -1;
- }
- return rc;
- }
- /*
- * Prevent confusion if running from erased flash memory
- */
- int fw_env_open(struct env_opts *opts)
- {
- int crc0, crc0_ok;
- unsigned char flag0;
- void *addr0 = NULL;
- int crc1, crc1_ok;
- unsigned char flag1;
- void *addr1 = NULL;
- int ret;
- struct env_image_single *single;
- struct env_image_redundant *redundant;
- if (!opts)
- opts = &default_opts;
- if (parse_config(opts)) /* should fill envdevices */
- return -EINVAL;
- addr0 = calloc(1, CUR_ENVSIZE);
- if (addr0 == NULL) {
- fprintf(stderr,
- "Not enough memory for environment (%ld bytes)\n",
- CUR_ENVSIZE);
- ret = -ENOMEM;
- goto open_cleanup;
- }
- /* read environment from FLASH to local buffer */
- environment.image = addr0;
- if (have_redund_env) {
- redundant = addr0;
- environment.crc = &redundant->crc;
- environment.flags = &redundant->flags;
- environment.data = redundant->data;
- } else {
- single = addr0;
- environment.crc = &single->crc;
- environment.flags = NULL;
- environment.data = single->data;
- }
- dev_current = 0;
- if (flash_io(O_RDONLY)) {
- ret = -EIO;
- goto open_cleanup;
- }
- crc0 = crc32(0, (uint8_t *)environment.data, ENV_SIZE);
- crc0_ok = (crc0 == *environment.crc);
- if (!have_redund_env) {
- if (!crc0_ok) {
- fprintf(stderr,
- "Warning: Bad CRC, using default environment\n");
- memcpy(environment.data, default_environment,
- sizeof(default_environment));
- }
- } else {
- flag0 = *environment.flags;
- dev_current = 1;
- addr1 = calloc(1, CUR_ENVSIZE);
- if (addr1 == NULL) {
- fprintf(stderr,
- "Not enough memory for environment (%ld bytes)\n",
- CUR_ENVSIZE);
- ret = -ENOMEM;
- goto open_cleanup;
- }
- redundant = addr1;
- /*
- * have to set environment.image for flash_read(), careful -
- * other pointers in environment still point inside addr0
- */
- environment.image = addr1;
- if (flash_io(O_RDONLY)) {
- ret = -EIO;
- goto open_cleanup;
- }
- /* Check flag scheme compatibility */
- if (DEVTYPE(dev_current) == MTD_NORFLASH &&
- DEVTYPE(!dev_current) == MTD_NORFLASH) {
- environment.flag_scheme = FLAG_BOOLEAN;
- } else if (DEVTYPE(dev_current) == MTD_NANDFLASH &&
- DEVTYPE(!dev_current) == MTD_NANDFLASH) {
- environment.flag_scheme = FLAG_INCREMENTAL;
- } else if (DEVTYPE(dev_current) == MTD_DATAFLASH &&
- DEVTYPE(!dev_current) == MTD_DATAFLASH) {
- environment.flag_scheme = FLAG_BOOLEAN;
- } else if (DEVTYPE(dev_current) == MTD_UBIVOLUME &&
- DEVTYPE(!dev_current) == MTD_UBIVOLUME) {
- environment.flag_scheme = FLAG_INCREMENTAL;
- } else if (DEVTYPE(dev_current) == MTD_ABSENT &&
- DEVTYPE(!dev_current) == MTD_ABSENT &&
- IS_UBI(dev_current) == IS_UBI(!dev_current)) {
- environment.flag_scheme = FLAG_INCREMENTAL;
- } else {
- fprintf(stderr, "Incompatible flash types!\n");
- ret = -EINVAL;
- goto open_cleanup;
- }
- crc1 = crc32(0, (uint8_t *)redundant->data, ENV_SIZE);
- crc1_ok = (crc1 == redundant->crc);
- flag1 = redundant->flags;
- if (crc0_ok && !crc1_ok) {
- dev_current = 0;
- } else if (!crc0_ok && crc1_ok) {
- dev_current = 1;
- } else if (!crc0_ok && !crc1_ok) {
- fprintf(stderr,
- "Warning: Bad CRC, using default environment\n");
- memcpy(environment.data, default_environment,
- sizeof(default_environment));
- dev_current = 0;
- } else {
- switch (environment.flag_scheme) {
- case FLAG_BOOLEAN:
- if (flag0 == ENV_REDUND_ACTIVE &&
- flag1 == ENV_REDUND_OBSOLETE) {
- dev_current = 0;
- } else if (flag0 == ENV_REDUND_OBSOLETE &&
- flag1 == ENV_REDUND_ACTIVE) {
- dev_current = 1;
- } else if (flag0 == flag1) {
- dev_current = 0;
- } else if (flag0 == 0xFF) {
- dev_current = 0;
- } else if (flag1 == 0xFF) {
- dev_current = 1;
- } else {
- dev_current = 0;
- }
- break;
- case FLAG_INCREMENTAL:
- if (flag0 == 255 && flag1 == 0)
- dev_current = 1;
- else if ((flag1 == 255 && flag0 == 0) ||
- flag0 >= flag1)
- dev_current = 0;
- else /* flag1 > flag0 */
- dev_current = 1;
- break;
- default:
- fprintf(stderr, "Unknown flag scheme %u\n",
- environment.flag_scheme);
- return -1;
- }
- }
- /*
- * If we are reading, we don't need the flag and the CRC any
- * more, if we are writing, we will re-calculate CRC and update
- * flags before writing out
- */
- if (dev_current) {
- environment.image = addr1;
- environment.crc = &redundant->crc;
- environment.flags = &redundant->flags;
- environment.data = redundant->data;
- free(addr0);
- } else {
- environment.image = addr0;
- /* Other pointers are already set */
- free(addr1);
- }
- #ifdef DEBUG
- fprintf(stderr, "Selected env in %s\n", DEVNAME(dev_current));
- #endif
- }
- return 0;
- open_cleanup:
- if (addr0)
- free(addr0);
- if (addr1)
- free(addr1);
- return ret;
- }
- /*
- * Simply free allocated buffer with environment
- */
- int fw_env_close(struct env_opts *opts)
- {
- if (environment.image)
- free(environment.image);
- environment.image = NULL;
- return 0;
- }
- static int check_device_config(int dev)
- {
- struct stat st;
- int32_t lnum = 0;
- int fd, rc = 0;
- /* Fills in IS_UBI(), converts DEVNAME() with ubi volume name */
- ubi_check_dev(dev);
- fd = open(DEVNAME(dev), O_RDONLY);
- if (fd < 0) {
- fprintf(stderr,
- "Cannot open %s: %s\n", DEVNAME(dev), strerror(errno));
- return -1;
- }
- rc = fstat(fd, &st);
- if (rc < 0) {
- fprintf(stderr, "Cannot stat the file %s\n", DEVNAME(dev));
- goto err;
- }
- if (IS_UBI(dev)) {
- rc = ioctl(fd, UBI_IOCEBISMAP, &lnum);
- if (rc < 0) {
- fprintf(stderr, "Cannot get UBI information for %s\n",
- DEVNAME(dev));
- goto err;
- }
- } else if (S_ISCHR(st.st_mode)) {
- struct mtd_info_user mtdinfo;
- rc = ioctl(fd, MEMGETINFO, &mtdinfo);
- if (rc < 0) {
- fprintf(stderr, "Cannot get MTD information for %s\n",
- DEVNAME(dev));
- goto err;
- }
- if (mtdinfo.type != MTD_NORFLASH &&
- mtdinfo.type != MTD_NANDFLASH &&
- mtdinfo.type != MTD_DATAFLASH &&
- mtdinfo.type != MTD_UBIVOLUME) {
- fprintf(stderr, "Unsupported flash type %u on %s\n",
- mtdinfo.type, DEVNAME(dev));
- goto err;
- }
- DEVTYPE(dev) = mtdinfo.type;
- if (DEVESIZE(dev) == 0)
- /* Assume the erase size is the same as the env-size */
- DEVESIZE(dev) = ENVSIZE(dev);
- } else {
- uint64_t size;
- DEVTYPE(dev) = MTD_ABSENT;
- if (DEVESIZE(dev) == 0)
- /* Assume the erase size to be 512 bytes */
- DEVESIZE(dev) = 0x200;
- /*
- * Check for negative offsets, treat it as backwards offset
- * from the end of the block device
- */
- if (DEVOFFSET(dev) < 0) {
- rc = ioctl(fd, BLKGETSIZE64, &size);
- if (rc < 0) {
- fprintf(stderr,
- "Could not get block device size on %s\n",
- DEVNAME(dev));
- goto err;
- }
- DEVOFFSET(dev) = DEVOFFSET(dev) + size;
- #ifdef DEBUG
- fprintf(stderr,
- "Calculated device offset 0x%llx on %s\n",
- DEVOFFSET(dev), DEVNAME(dev));
- #endif
- }
- }
- if (ENVSECTORS(dev) == 0)
- /* Assume enough sectors to cover the environment */
- ENVSECTORS(dev) = DIV_ROUND_UP(ENVSIZE(dev), DEVESIZE(dev));
- if (DEVOFFSET(dev) % DEVESIZE(dev) != 0) {
- fprintf(stderr,
- "Environment does not start on (erase) block boundary\n");
- errno = EINVAL;
- return -1;
- }
- if (ENVSIZE(dev) > ENVSECTORS(dev) * DEVESIZE(dev)) {
- fprintf(stderr,
- "Environment does not fit into available sectors\n");
- errno = EINVAL;
- return -1;
- }
- err:
- close(fd);
- return rc;
- }
- static int parse_config(struct env_opts *opts)
- {
- int rc;
- if (!opts)
- opts = &default_opts;
- #if defined(CONFIG_FILE)
- /* Fills in DEVNAME(), ENVSIZE(), DEVESIZE(). Or don't. */
- if (get_config(opts->config_file)) {
- fprintf(stderr, "Cannot parse config file '%s': %m\n",
- opts->config_file);
- return -1;
- }
- #else
- DEVNAME(0) = DEVICE1_NAME;
- DEVOFFSET(0) = DEVICE1_OFFSET;
- ENVSIZE(0) = ENV1_SIZE;
- /* Set defaults for DEVESIZE, ENVSECTORS later once we
- * know DEVTYPE
- */
- #ifdef DEVICE1_ESIZE
- DEVESIZE(0) = DEVICE1_ESIZE;
- #endif
- #ifdef DEVICE1_ENVSECTORS
- ENVSECTORS(0) = DEVICE1_ENVSECTORS;
- #endif
- #ifdef HAVE_REDUND
- DEVNAME(1) = DEVICE2_NAME;
- DEVOFFSET(1) = DEVICE2_OFFSET;
- ENVSIZE(1) = ENV2_SIZE;
- /* Set defaults for DEVESIZE, ENVSECTORS later once we
- * know DEVTYPE
- */
- #ifdef DEVICE2_ESIZE
- DEVESIZE(1) = DEVICE2_ESIZE;
- #endif
- #ifdef DEVICE2_ENVSECTORS
- ENVSECTORS(1) = DEVICE2_ENVSECTORS;
- #endif
- have_redund_env = 1;
- #endif
- #endif
- rc = check_device_config(0);
- if (rc < 0)
- return rc;
- if (have_redund_env) {
- rc = check_device_config(1);
- if (rc < 0)
- return rc;
- if (ENVSIZE(0) != ENVSIZE(1)) {
- fprintf(stderr,
- "Redundant environments have unequal size\n");
- return -1;
- }
- }
- usable_envsize = CUR_ENVSIZE - sizeof(uint32_t);
- if (have_redund_env)
- usable_envsize -= sizeof(char);
- return 0;
- }
- #if defined(CONFIG_FILE)
- static int get_config(char *fname)
- {
- FILE *fp;
- int i = 0;
- int rc;
- char *line = NULL;
- size_t linesize = 0;
- char *devname;
- fp = fopen(fname, "r");
- if (fp == NULL)
- return -1;
- while (i < 2 && getline(&line, &linesize, fp) != -1) {
- /* Skip comment strings */
- if (line[0] == '#')
- continue;
- rc = sscanf(line, "%ms %lli %lx %lx %lx",
- &devname,
- &DEVOFFSET(i),
- &ENVSIZE(i), &DEVESIZE(i), &ENVSECTORS(i));
- if (rc < 3)
- continue;
- DEVNAME(i) = devname;
- /* Set defaults for DEVESIZE, ENVSECTORS later once we
- * know DEVTYPE
- */
- i++;
- }
- free(line);
- fclose(fp);
- have_redund_env = i - 1;
- if (!i) { /* No valid entries found */
- errno = EINVAL;
- return -1;
- } else
- return 0;
- }
- #endif
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