* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
+/* Note that unlike older versions of modules.dep/depmod (busybox and m-i-t),
+ * we expect the full dependency list to be specified in modules.dep.
+ * Older versions would only export the direct dependency list.
+ */
#include "libbb.h"
#include "modutils.h"
#include <sys/utsname.h>
#include <fnmatch.h>
-struct modprobe_option {
- char *module;
- char *option;
+//#define DBG(fmt, ...) bb_error_msg("%s: " fmt, __func__, ## __VA_ARGS__)
+#define DBG(...) ((void)0)
+
+#define MODULE_FLAG_LOADED 0x0001
+#define MODULE_FLAG_NEED_DEPS 0x0002
+/* "was seen in modules.dep": */
+#define MODULE_FLAG_FOUND_IN_MODDEP 0x0004
+#define MODULE_FLAG_BLACKLISTED 0x0008
+
+struct module_entry { /* I'll call it ME. */
+ unsigned flags;
+ char *modname; /* stripped of /path/, .ext and s/-/_/g */
+ const char *probed_name; /* verbatim as seen on cmdline */
+ char *options; /* options from config files */
+ llist_t *realnames; /* strings. if this module is an alias, */
+ /* real module name is one of these. */
+//Can there really be more than one? Example from real kernel?
+ llist_t *deps; /* strings. modules we depend on */
};
-struct modprobe_conf {
- char probename[MODULE_NAME_LEN];
- llist_t *options;
- llist_t *aliases;
-#if ENABLE_FEATURE_MODPROBE_BLACKLIST
-#define add_to_blacklist(conf, name) llist_add_to(&conf->blacklist, name)
-#define check_blacklist(conf, name) (llist_find(conf->blacklist, name) == NULL)
- llist_t *blacklist;
-#else
-#define add_to_blacklist(conf, name) do {} while (0)
-#define check_blacklist(conf, name) (1)
-#endif
+/* NB: INSMOD_OPT_SILENT bit suppresses ONLY non-existent modules,
+ * not deleted ones (those are still listed in modules.dep).
+ * module-init-tools version 3.4:
+ * # modprobe bogus
+ * FATAL: Module bogus not found. [exitcode 1]
+ * # modprobe -q bogus [silent, exitcode still 1]
+ * but:
+ * # rm kernel/drivers/net/dummy.ko
+ * # modprobe -q dummy
+ * FATAL: Could not open '/lib/modules/xxx/kernel/drivers/net/dummy.ko': No such file or directory
+ * [exitcode 1]
+ */
+#define MODPROBE_OPTS "acdlnrt:VC:" IF_FEATURE_MODPROBE_BLACKLIST("b")
+enum {
+ MODPROBE_OPT_INSERT_ALL = (INSMOD_OPT_UNUSED << 0), /* a */
+ MODPROBE_OPT_DUMP_ONLY = (INSMOD_OPT_UNUSED << 1), /* c */
+ MODPROBE_OPT_D = (INSMOD_OPT_UNUSED << 2), /* d */
+ MODPROBE_OPT_LIST_ONLY = (INSMOD_OPT_UNUSED << 3), /* l */
+ MODPROBE_OPT_SHOW_ONLY = (INSMOD_OPT_UNUSED << 4), /* n */
+ MODPROBE_OPT_REMOVE = (INSMOD_OPT_UNUSED << 5), /* r */
+ MODPROBE_OPT_RESTRICT = (INSMOD_OPT_UNUSED << 6), /* t */
+ MODPROBE_OPT_VERONLY = (INSMOD_OPT_UNUSED << 7), /* V */
+ MODPROBE_OPT_CONFIGFILE = (INSMOD_OPT_UNUSED << 8), /* C */
+ MODPROBE_OPT_BLACKLIST = (INSMOD_OPT_UNUSED << 9) * ENABLE_FEATURE_MODPROBE_BLACKLIST,
};
-#define MODPROBE_OPTS "acdlnrt:VC:" USE_FEATURE_MODPROBE_BLACKLIST("b")
-enum {
- MODPROBE_OPT_INSERT_ALL = (INSMOD_OPT_UNUSED << 0), /* a */
- MODPROBE_OPT_DUMP_ONLY = (INSMOD_OPT_UNUSED << 1), /* c */
- MODPROBE_OPT_D = (INSMOD_OPT_UNUSED << 2), /* d */
- MODPROBE_OPT_LIST_ONLY = (INSMOD_OPT_UNUSED << 3), /* l */
- MODPROBE_OPT_SHOW_ONLY = (INSMOD_OPT_UNUSED << 4), /* n */
- MODPROBE_OPT_REMOVE = (INSMOD_OPT_UNUSED << 5), /* r */
- MODPROBE_OPT_RESTRICT = (INSMOD_OPT_UNUSED << 6), /* t */
- MODPROBE_OPT_VERONLY = (INSMOD_OPT_UNUSED << 7), /* V */
- MODPROBE_OPT_CONFIGFILE = (INSMOD_OPT_UNUSED << 8), /* C */
- MODPROBE_OPT_BLACKLIST = (INSMOD_OPT_UNUSED << 9) * ENABLE_FEATURE_MODPROBE_BLACKLIST,
+struct globals {
+ llist_t *db; /* MEs of all modules ever seen (caching for speed) */
+ llist_t *probes; /* MEs of module(s) requested on cmdline */
+ char *cmdline_mopts; /* module options from cmdline */
+ int num_unresolved_deps;
+ /* bool. "Did we have 'symbol:FOO' requested on cmdline?" */
+ smallint need_symbols;
};
+#define G (*(struct globals*)&bb_common_bufsiz1)
+#define INIT_G() do { } while (0)
+
-static llist_t *loaded;
+static int read_config(const char *path);
-static int read_config(struct modprobe_conf *conf, const char *path);
+static char *gather_options_str(char *opts, const char *append)
+{
+ /* Speed-optimized. We call gather_options_str many times. */
+ if (opts == NULL) {
+ opts = xstrdup(append);
+ } else {
+ int optlen = strlen(opts);
+ opts = xrealloc(opts, optlen + strlen(append) + 2);
+ sprintf(opts + optlen, " %s", append);
+ }
+ return opts;
+}
-static void add_option(llist_t **all_opts, const char *module, const char *opts)
+static struct module_entry *helper_get_module(const char *module, int create)
{
- struct modprobe_option *o;
+ char modname[MODULE_NAME_LEN];
+ struct module_entry *e;
+ llist_t *l;
+
+ filename2modname(module, modname);
+ for (l = G.db; l != NULL; l = l->link) {
+ e = (struct module_entry *) l->data;
+ if (strcmp(e->modname, modname) == 0)
+ return e;
+ }
+ if (!create)
+ return NULL;
- o = xzalloc(sizeof(struct modprobe_option));
- if (module)
- o->module = filename2modname(module, NULL);
- o->option = xstrdup(opts);
- llist_add_to(all_opts, o);
+ e = xzalloc(sizeof(*e));
+ e->modname = xstrdup(modname);
+ llist_add_to(&G.db, e);
+
+ return e;
+}
+static struct module_entry *get_or_add_modentry(const char *module)
+{
+ return helper_get_module(module, 1);
+}
+static struct module_entry *get_modentry(const char *module)
+{
+ return helper_get_module(module, 0);
+}
+
+static void add_probe(const char *name)
+{
+ struct module_entry *m;
+
+ m = get_or_add_modentry(name);
+ if (!(option_mask32 & MODPROBE_OPT_REMOVE)
+ && (m->flags & MODULE_FLAG_LOADED)
+ ) {
+ DBG("skipping %s, it is already loaded", name);
+ return;
+ }
+
+ DBG("queuing %s", name);
+ m->probed_name = name;
+ m->flags |= MODULE_FLAG_NEED_DEPS;
+ llist_add_to_end(&G.probes, m);
+ G.num_unresolved_deps++;
+ if (ENABLE_FEATURE_MODUTILS_SYMBOLS
+ && strncmp(m->modname, "symbol:", 7) == 0
+ ) {
+ G.need_symbols = 1;
+ }
}
static int FAST_FUNC config_file_action(const char *filename,
struct stat *statbuf UNUSED_PARAM,
- void *userdata,
+ void *userdata UNUSED_PARAM,
int depth UNUSED_PARAM)
{
- struct modprobe_conf *conf = (struct modprobe_conf *) userdata;
- RESERVE_CONFIG_BUFFER(modname, MODULE_NAME_LEN);
char *tokens[3];
parser_t *p;
+ struct module_entry *m;
int rc = TRUE;
if (bb_basename(filename)[0] == '.')
}
while (config_read(p, tokens, 3, 2, "# \t", PARSE_NORMAL)) {
+//Use index_in_strings?
if (strcmp(tokens[0], "alias") == 0) {
- filename2modname(tokens[1], modname);
- if (tokens[2] &&
- fnmatch(modname, conf->probename, 0) == 0)
- llist_add_to(&conf->aliases,
- filename2modname(tokens[2], NULL));
+ /* alias <wildcard> <modulename> */
+ llist_t *l;
+ char wildcard[MODULE_NAME_LEN];
+ char *rmod;
+
+ if (tokens[2] == NULL)
+ continue;
+ filename2modname(tokens[1], wildcard);
+
+ for (l = G.probes; l != NULL; l = l->link) {
+ m = (struct module_entry *) l->data;
+ if (fnmatch(wildcard, m->modname, 0) != 0)
+ continue;
+ rmod = filename2modname(tokens[2], NULL);
+ llist_add_to(&m->realnames, rmod);
+
+ if (m->flags & MODULE_FLAG_NEED_DEPS) {
+ m->flags &= ~MODULE_FLAG_NEED_DEPS;
+ G.num_unresolved_deps--;
+ }
+
+ m = get_or_add_modentry(rmod);
+ if (!(m->flags & MODULE_FLAG_NEED_DEPS)) {
+ m->flags |= MODULE_FLAG_NEED_DEPS;
+ G.num_unresolved_deps++;
+ }
+ }
} else if (strcmp(tokens[0], "options") == 0) {
- if (tokens[2])
- add_option(&conf->options, tokens[1], tokens[2]);
+ /* options <modulename> <option...> */
+ if (tokens[2] == NULL)
+ continue;
+ m = get_or_add_modentry(tokens[1]);
+ m->options = gather_options_str(m->options, tokens[2]);
} else if (strcmp(tokens[0], "include") == 0) {
- read_config(conf, tokens[1]);
- } else if (ENABLE_FEATURE_MODPROBE_BLACKLIST &&
- strcmp(tokens[0], "blacklist") == 0) {
- add_to_blacklist(conf, xstrdup(tokens[1]));
+ /* include <filename> */
+ read_config(tokens[1]);
+ } else if (ENABLE_FEATURE_MODPROBE_BLACKLIST
+ && strcmp(tokens[0], "blacklist") == 0
+ ) {
+ /* blacklist <modulename> */
+ get_or_add_modentry(tokens[1])->flags |= MODULE_FLAG_BLACKLISTED;
}
}
config_close(p);
-error:
- RELEASE_CONFIG_BUFFER(modname);
+ error:
return rc;
}
-static int read_config(struct modprobe_conf *conf, const char *path)
+static int read_config(const char *path)
{
return recursive_action(path, ACTION_RECURSE | ACTION_QUIET,
- config_file_action, NULL, conf, 1);
+ config_file_action, NULL, NULL, 1);
+}
+
+static const char *humanly_readable_name(struct module_entry *m)
+{
+ /* probed_name may be NULL. modname always exists. */
+ return m->probed_name ? m->probed_name : m->modname;
}
-static char *gather_options(llist_t *first, const char *module, int usecmdline)
+/* Return: similar to bb_init_module:
+ * 0 on success,
+ * -errno on open/read error,
+ * errno on init_module() error
+ */
+static int do_modprobe(struct module_entry *m)
{
- struct modprobe_option *opt;
- llist_t *n;
- char *opts = xstrdup("");
- int optlen = 0;
+ struct module_entry *m2 = m2; /* for compiler */
+ char *fn, *options;
+ int rc, first;
+ llist_t *l;
+
+ if (!(m->flags & MODULE_FLAG_FOUND_IN_MODDEP)) {
+ if (!(option_mask32 & INSMOD_OPT_SILENT))
+ bb_error_msg("module %s not found in modules.dep",
+ humanly_readable_name(m));
+ return -ENOENT;
+ }
+ DBG("do_modprob'ing %s", m->modname);
+
+ if (!(option_mask32 & MODPROBE_OPT_REMOVE))
+ m->deps = llist_rev(m->deps);
- for (n = first; n != NULL; n = n->link) {
- opt = (struct modprobe_option *) n->data;
+ for (l = m->deps; l != NULL; l = l->link)
+ DBG("dep: %s", l->data);
- if (opt->module == NULL && !usecmdline)
+ first = 1;
+ rc = 0;
+ while (m->deps) {
+ rc = 0;
+ fn = llist_pop(&m->deps); /* we leak it */
+ m2 = get_or_add_modentry(fn);
+
+ if (option_mask32 & MODPROBE_OPT_REMOVE) {
+ /* modprobe -r */
+ if (m2->flags & MODULE_FLAG_LOADED) {
+ rc = bb_delete_module(m2->modname, O_EXCL);
+ if (rc) {
+ if (first) {
+ bb_error_msg("failed to unload module %s: %s",
+ humanly_readable_name(m2),
+ moderror(rc));
+ break;
+ }
+ } else {
+ m2->flags &= ~MODULE_FLAG_LOADED;
+ }
+ }
+ /* do not error out if *deps* fail to unload */
+ first = 0;
continue;
- if (opt->module != NULL && strcmp(opt->module, module) != 0)
+ }
+
+ if (m2->flags & MODULE_FLAG_LOADED) {
+ DBG("%s is already loaded, skipping", fn);
continue;
+ }
- opts = xrealloc(opts, optlen + strlen(opt->option) + 2);
- optlen += sprintf(opts + optlen, "%s ", opt->option);
+ options = m2->options;
+ m2->options = NULL;
+ if (m == m2)
+ options = gather_options_str(options, G.cmdline_mopts);
+ rc = bb_init_module(fn, options);
+ DBG("loaded %s '%s', rc:%d", fn, options, rc);
+ free(options);
+ if (rc) {
+ bb_error_msg("failed to load module %s (%s): %s",
+ humanly_readable_name(m2),
+ fn,
+ moderror(rc)
+ );
+ break;
+ }
+ m2->flags |= MODULE_FLAG_LOADED;
}
- return opts;
+
+ return rc;
}
-static int do_modprobe(struct modprobe_conf *conf, const char *module)
+static void load_modules_dep(void)
{
- RESERVE_CONFIG_BUFFER(modname, MODULE_NAME_LEN);
- llist_t *deps = NULL;
- char *fn, *options, *colon = NULL, *tokens[2];
+ struct module_entry *m;
+ char *colon, *tokens[2];
parser_t *p;
- int rc = -1;
- p = config_open2(CONFIG_DEFAULT_DEPMOD_FILE, fopen_for_read);
- /* Modprobe does not work at all without modprobe.dep,
+ /* Modprobe does not work at all without modules.dep,
* even if the full module name is given. Returning error here
* was making us later confuse user with this message:
* "module /full/path/to/existing/file/module.ko not found".
- * It's better to die immediately, with good message: */
- if (p == NULL)
- bb_perror_msg_and_die("can't open '%s'", CONFIG_DEFAULT_DEPMOD_FILE);
+ * It's better to die immediately, with good message.
+ * xfopen_for_read provides that. */
+ p = config_open2(CONFIG_DEFAULT_DEPMOD_FILE, xfopen_for_read);
- while (config_read(p, tokens, 2, 1, "# \t", PARSE_NORMAL)) {
+ while (G.num_unresolved_deps
+ && config_read(p, tokens, 2, 1, "# \t", PARSE_NORMAL)
+ ) {
colon = last_char_is(tokens[0], ':');
if (colon == NULL)
continue;
+ *colon = 0;
- filename2modname(tokens[0], modname);
- if (strcmp(modname, module) == 0)
- break;
-
- colon = NULL;
- }
- if (colon == NULL)
- goto error_not_found;
-
- colon[0] = '\0';
- llist_add_to(&deps, xstrdup(tokens[0]));
- if (tokens[1])
- string_to_llist(tokens[1], &deps, " ");
-
- if (!(option_mask32 & MODPROBE_OPT_REMOVE))
- deps = llist_rev(deps);
+ m = get_modentry(tokens[0]);
+ if (m == NULL)
+ continue;
- rc = 0;
- while (deps && rc == 0) {
- fn = llist_pop(&deps);
- filename2modname(fn, modname);
- if (option_mask32 & MODPROBE_OPT_REMOVE) {
- if (bb_delete_module(modname, O_EXCL) != 0)
- rc = errno;
- } else if (llist_find(loaded, modname) == NULL) {
- options = gather_options(conf->options, modname,
- strcmp(modname, module) == 0);
- rc = bb_init_module(fn, options);
- if (rc == 0)
- llist_add_to(&loaded, xstrdup(modname));
- free(options);
+ /* Optimization... */
+ if ((m->flags & MODULE_FLAG_LOADED)
+ && !(option_mask32 & MODPROBE_OPT_REMOVE)
+ ) {
+ DBG("skip deps of %s, it's already loaded", tokens[0]);
+ continue;
}
- free(fn);
+ m->flags |= MODULE_FLAG_FOUND_IN_MODDEP;
+ if ((m->flags & MODULE_FLAG_NEED_DEPS) && (m->deps == NULL)) {
+ G.num_unresolved_deps--;
+ llist_add_to(&m->deps, xstrdup(tokens[0]));
+ if (tokens[1])
+ string_to_llist(tokens[1], &m->deps, " \t");
+ } else
+ DBG("skipping dep line");
}
-
- error_not_found:
config_close(p);
-
- if (rc > 0 && !(option_mask32 & INSMOD_OPT_SILENT))
- bb_error_msg("failed to %sload module %s: %s",
- (option_mask32 & MODPROBE_OPT_REMOVE) ? "un" : "",
- module, moderror(rc));
-
- RELEASE_CONFIG_BUFFER(modname);
- return rc;
}
int modprobe_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
struct utsname uts;
int rc;
unsigned opt;
- llist_t *options = NULL;
+ struct module_entry *me;
opt_complementary = "q-v:v-q";
- opt = getopt32(argv, INSMOD_OPTS MODPROBE_OPTS INSMOD_ARGS,
- NULL, NULL);
+ opt = getopt32(argv, INSMOD_OPTS MODPROBE_OPTS INSMOD_ARGS, NULL, NULL);
argv += optind;
if (opt & (MODPROBE_OPT_DUMP_ONLY | MODPROBE_OPT_LIST_ONLY |
MODPROBE_OPT_SHOW_ONLY))
bb_error_msg_and_die("not supported");
- /* goto modules location */
- xchdir(CONFIG_DEFAULT_MODULES_DIR);
- uname(&uts);
- xchdir(uts.release);
-
if (!argv[0]) {
if (opt & MODPROBE_OPT_REMOVE) {
- if (bb_delete_module(NULL, O_NONBLOCK|O_EXCL) != 0)
+ /* "modprobe -r" (w/o params).
+ * "If name is NULL, all unused modules marked
+ * autoclean will be removed".
+ */
+ if (bb_delete_module(NULL, O_NONBLOCK | O_EXCL) != 0)
bb_perror_msg_and_die("rmmod");
}
return EXIT_SUCCESS;
}
- if (!(opt & MODPROBE_OPT_INSERT_ALL)) {
- /* If not -a, we have only one module name,
- * the rest of parameters are options */
- add_option(&options, NULL, parse_cmdline_module_options(argv));
- argv[1] = NULL;
- }
- /* cache modules */
+ /* Goto modules location */
+ xchdir(CONFIG_DEFAULT_MODULES_DIR);
+ uname(&uts);
+ xchdir(uts.release);
+
+ /* Retrieve module names of already loaded modules */
{
char *s;
parser_t *parser = config_open2("/proc/modules", fopen_for_read);
while (config_read(parser, &s, 1, 1, "# \t", PARSE_NORMAL & ~PARSE_GREEDY))
- llist_add_to(&loaded, xstrdup(s));
+ get_or_add_modentry(s)->flags |= MODULE_FLAG_LOADED;
config_close(parser);
}
- while (*argv) {
- const char *arg = *argv;
- struct modprobe_conf *conf;
-
- conf = xzalloc(sizeof(*conf));
- conf->options = options;
- filename2modname(arg, conf->probename);
- read_config(conf, "/etc/modprobe.conf");
- read_config(conf, "/etc/modprobe.d");
- if (ENABLE_FEATURE_MODUTILS_SYMBOLS
- && conf->aliases == NULL
- && strncmp(arg, "symbol:", 7) == 0
- ) {
- read_config(conf, "modules.symbols");
- }
+ if (opt & (MODPROBE_OPT_INSERT_ALL | MODPROBE_OPT_REMOVE)) {
+ /* Each argument is a module name */
+ do {
+ DBG("adding module %s", *argv);
+ add_probe(*argv++);
+ } while (*argv);
+ } else {
+ /* First argument is module name, rest are parameters */
+ DBG("probing just module %s", *argv);
+ add_probe(argv[0]);
+ G.cmdline_mopts = parse_cmdline_module_options(argv);
+ }
- if (ENABLE_FEATURE_MODUTILS_ALIAS && conf->aliases == NULL)
- read_config(conf, "modules.alias");
-
- if (conf->aliases == NULL) {
- /* Try if module by literal name is found; literal
- * names are blacklist only if '-b' is given. */
- if (!(opt & MODPROBE_OPT_BLACKLIST) ||
- check_blacklist(conf, conf->probename)) {
- rc = do_modprobe(conf, conf->probename);
- if (rc < 0 && !(opt & INSMOD_OPT_SILENT))
- bb_error_msg("module %s not found", arg);
- }
- } else {
- /* Probe all aliases */
- while (conf->aliases != NULL) {
- char *realname = llist_pop(&conf->aliases);
- if (check_blacklist(conf, realname))
- do_modprobe(conf, realname);
- free(realname);
+ /* Happens if all requested modules are already loaded */
+ if (G.probes == NULL)
+ return EXIT_SUCCESS;
+
+ read_config("/etc/modprobe.conf");
+ read_config("/etc/modprobe.d");
+ if (ENABLE_FEATURE_MODUTILS_SYMBOLS && G.need_symbols)
+ read_config("modules.symbols");
+ load_modules_dep();
+ if (ENABLE_FEATURE_MODUTILS_ALIAS && G.num_unresolved_deps) {
+ read_config("modules.alias");
+ load_modules_dep();
+ }
+
+ rc = 0;
+ while ((me = llist_pop(&G.probes)) != NULL) {
+ if (me->realnames == NULL) {
+ DBG("probing by module name");
+ /* This is not an alias. Literal names are blacklisted
+ * only if '-b' is given.
+ */
+ if (!(opt & MODPROBE_OPT_BLACKLIST)
+ || !(me->flags & MODULE_FLAG_BLACKLISTED)
+ ) {
+ rc |= do_modprobe(me);
}
+ continue;
}
- argv++;
+
+ /* Probe all real names for the alias */
+ do {
+ char *realname = llist_pop(&me->realnames);
+ struct module_entry *m2;
+
+ DBG("probing alias %s by realname %s", me->modname, realname);
+ m2 = get_or_add_modentry(realname);
+ if (!(m2->flags & MODULE_FLAG_BLACKLISTED)
+ && (!(m2->flags & MODULE_FLAG_LOADED)
+ || (opt & MODPROBE_OPT_REMOVE))
+ ) {
+//TODO: we can pass "me" as 2nd param to do_modprobe,
+//and make do_modprobe emit more meaningful error messages
+//with alias name included, not just module name alias resolves to.
+ rc |= do_modprobe(m2);
+ }
+ free(realname);
+ } while (me->realnames != NULL);
}
- return EXIT_SUCCESS;
+ return (rc != 0);
}
projects / oweals / busybox.git / blobdiff