1 /* vi: set sw=4 ts=4: */
3 * Modprobe written from scratch for BusyBox
5 * Copyright (c) 2008 Timo Teras <timo.teras@iki.fi>
6 * Copyright (c) 2008 Vladimir Dronnikov
8 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
13 #include <sys/utsname.h>
16 //#define DBG(fmt, ...) bb_error_msg("%s: " fmt, __func__, ## __VA_ARGS__)
17 #define DBG(...) ((void)0)
19 #define MODULE_FLAG_LOADED 0x0001
20 #define MODULE_FLAG_NEED_DEPS 0x0002
21 /* "was seen in modules.dep": */
22 #define MODULE_FLAG_FOUND_IN_MODDEP 0x0004
23 #define MODULE_FLAG_BLACKLISTED 0x0008
25 struct module_entry { /* I'll call it ME. */
27 char *modname; /* stripped of /path/, .ext and s/-/_/g */
28 const char *probed_name; /* verbatim as seen on cmdline */
29 char *options; /* options from config files */
30 llist_t *realnames; /* strings. if this module is an alias, */
31 /* real module name is one of these. */
32 //Can there really be more than one? Example from real kernel?
33 llist_t *deps; /* strings. modules we depend on */
36 #define MODPROBE_OPTS "acdlnrt:VC:" IF_FEATURE_MODPROBE_BLACKLIST("b")
38 MODPROBE_OPT_INSERT_ALL = (INSMOD_OPT_UNUSED << 0), /* a */
39 MODPROBE_OPT_DUMP_ONLY = (INSMOD_OPT_UNUSED << 1), /* c */
40 MODPROBE_OPT_D = (INSMOD_OPT_UNUSED << 2), /* d */
41 MODPROBE_OPT_LIST_ONLY = (INSMOD_OPT_UNUSED << 3), /* l */
42 MODPROBE_OPT_SHOW_ONLY = (INSMOD_OPT_UNUSED << 4), /* n */
43 MODPROBE_OPT_REMOVE = (INSMOD_OPT_UNUSED << 5), /* r */
44 MODPROBE_OPT_RESTRICT = (INSMOD_OPT_UNUSED << 6), /* t */
45 MODPROBE_OPT_VERONLY = (INSMOD_OPT_UNUSED << 7), /* V */
46 MODPROBE_OPT_CONFIGFILE = (INSMOD_OPT_UNUSED << 8), /* C */
47 MODPROBE_OPT_BLACKLIST = (INSMOD_OPT_UNUSED << 9) * ENABLE_FEATURE_MODPROBE_BLACKLIST,
51 llist_t *db; /* MEs of all modules ever seen (caching for speed) */
52 llist_t *probes; /* MEs of module(s) requested on cmdline */
53 char *cmdline_mopts; /* module options from cmdline */
54 int num_unresolved_deps;
55 /* bool. "Did we have 'symbol:FOO' requested on cmdline?" */
56 smallint need_symbols;
58 #define G (*(struct globals*)&bb_common_bufsiz1)
59 #define INIT_G() do { } while (0)
62 static int read_config(const char *path);
64 static char *gather_options_str(char *opts, const char *append)
66 /* Speed-optimized. We call gather_options_str many times. */
68 opts = xstrdup(append);
70 int optlen = strlen(opts);
71 opts = xrealloc(opts, optlen + strlen(append) + 2);
72 sprintf(opts + optlen, " %s", append);
77 static struct module_entry *helper_get_module(const char *module, int create)
79 char modname[MODULE_NAME_LEN];
80 struct module_entry *e;
83 filename2modname(module, modname);
84 for (l = G.db; l != NULL; l = l->link) {
85 e = (struct module_entry *) l->data;
86 if (strcmp(e->modname, modname) == 0)
92 e = xzalloc(sizeof(*e));
93 e->modname = xstrdup(modname);
94 llist_add_to(&G.db, e);
98 static struct module_entry *get_or_add_modentry(const char *module)
100 return helper_get_module(module, 1);
102 static struct module_entry *get_modentry(const char *module)
104 return helper_get_module(module, 0);
107 static void add_probe(const char *name)
109 struct module_entry *m;
111 m = get_or_add_modentry(name);
112 if (m->flags & MODULE_FLAG_LOADED) {
113 DBG("skipping %s, it is already loaded", name);
117 DBG("queuing %s", name);
118 m->probed_name = name;
119 m->flags |= MODULE_FLAG_NEED_DEPS;
120 llist_add_to_end(&G.probes, m);
121 G.num_unresolved_deps++;
122 if (ENABLE_FEATURE_MODUTILS_SYMBOLS
123 && strncmp(m->modname, "symbol:", 7) == 0
129 static int FAST_FUNC config_file_action(const char *filename,
130 struct stat *statbuf UNUSED_PARAM,
131 void *userdata UNUSED_PARAM,
132 int depth UNUSED_PARAM)
136 struct module_entry *m;
139 if (bb_basename(filename)[0] == '.')
142 p = config_open2(filename, fopen_for_read);
148 while (config_read(p, tokens, 3, 2, "# \t", PARSE_NORMAL)) {
149 //Use index_in_strings?
150 if (strcmp(tokens[0], "alias") == 0) {
151 /* alias <wildcard> <modulename> */
153 char wildcard[MODULE_NAME_LEN];
156 if (tokens[2] == NULL)
158 filename2modname(tokens[1], wildcard);
160 for (l = G.probes; l != NULL; l = l->link) {
161 m = (struct module_entry *) l->data;
162 if (fnmatch(wildcard, m->modname, 0) != 0)
164 rmod = filename2modname(tokens[2], NULL);
165 llist_add_to(&m->realnames, rmod);
167 if (m->flags & MODULE_FLAG_NEED_DEPS) {
168 m->flags &= ~MODULE_FLAG_NEED_DEPS;
169 G.num_unresolved_deps--;
172 m = get_or_add_modentry(rmod);
173 if (!(m->flags & MODULE_FLAG_NEED_DEPS)) {
174 m->flags |= MODULE_FLAG_NEED_DEPS;
175 G.num_unresolved_deps++;
178 } else if (strcmp(tokens[0], "options") == 0) {
179 /* options <modulename> <option...> */
180 if (tokens[2] == NULL)
182 m = get_or_add_modentry(tokens[1]);
183 m->options = gather_options_str(m->options, tokens[2]);
184 } else if (strcmp(tokens[0], "include") == 0) {
185 /* include <filename> */
186 read_config(tokens[1]);
187 } else if (ENABLE_FEATURE_MODPROBE_BLACKLIST
188 && strcmp(tokens[0], "blacklist") == 0
190 /* blacklist <modulename> */
191 get_or_add_modentry(tokens[1])->flags |= MODULE_FLAG_BLACKLISTED;
199 static int read_config(const char *path)
201 return recursive_action(path, ACTION_RECURSE | ACTION_QUIET,
202 config_file_action, NULL, NULL, 1);
205 static int do_modprobe(struct module_entry *m)
207 struct module_entry *m2;
212 if (!(m->flags & MODULE_FLAG_FOUND_IN_MODDEP)) {
213 DBG("skipping %s, not found in modules.dep", m->modname);
216 DBG("do_modprob'ing %s", m->modname);
218 if (!(option_mask32 & MODPROBE_OPT_REMOVE))
219 m->deps = llist_rev(m->deps);
221 for (l = m->deps; l != NULL; l = l->link)
222 DBG("dep: %s", l->data);
225 while (m->deps && rc == 0) {
226 fn = llist_pop(&m->deps);
227 m2 = get_or_add_modentry(fn);
228 if (option_mask32 & MODPROBE_OPT_REMOVE) {
229 if (bb_delete_module(m->modname, O_EXCL) != 0)
231 } else if (!(m2->flags & MODULE_FLAG_LOADED)) {
232 options = m2->options;
235 options = gather_options_str(options, G.cmdline_mopts);
236 rc = bb_init_module(fn, options);
237 DBG("loaded %s '%s', rc:%d", fn, options, rc);
239 m2->flags |= MODULE_FLAG_LOADED;
242 DBG("%s is already loaded, skipping", fn);
248 //FIXME: what if rc < 0?
249 if (rc > 0 && !(option_mask32 & INSMOD_OPT_SILENT)) {
250 bb_error_msg("failed to %sload module %s: %s",
251 (option_mask32 & MODPROBE_OPT_REMOVE) ? "un" : "",
252 m->probed_name ? m->probed_name : m->modname,
260 static void load_modules_dep(void)
262 struct module_entry *m;
263 char *colon, *tokens[2];
266 /* Modprobe does not work at all without modprobe.dep,
267 * even if the full module name is given. Returning error here
268 * was making us later confuse user with this message:
269 * "module /full/path/to/existing/file/module.ko not found".
270 * It's better to die immediately, with good message.
271 * xfopen_for_read provides that. */
272 p = config_open2(CONFIG_DEFAULT_DEPMOD_FILE, xfopen_for_read);
274 while (G.num_unresolved_deps
275 && config_read(p, tokens, 2, 1, "# \t", PARSE_NORMAL)
277 colon = last_char_is(tokens[0], ':');
282 m = get_modentry(tokens[0]);
286 /* Optimization... */
287 if ((m->flags & MODULE_FLAG_LOADED)
288 && !(option_mask32 & MODPROBE_OPT_REMOVE)
290 DBG("skip deps of %s, it's already loaded", tokens[0]);
294 m->flags |= MODULE_FLAG_FOUND_IN_MODDEP;
295 if ((m->flags & MODULE_FLAG_NEED_DEPS) && (m->deps == NULL)) {
296 G.num_unresolved_deps--;
297 llist_add_to(&m->deps, xstrdup(tokens[0]));
299 string_to_llist(tokens[1], &m->deps, " ");
301 DBG("skipping dep line");
306 int modprobe_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
307 int modprobe_main(int argc UNUSED_PARAM, char **argv)
312 struct module_entry *me;
314 opt_complementary = "q-v:v-q";
315 opt = getopt32(argv, INSMOD_OPTS MODPROBE_OPTS INSMOD_ARGS, NULL, NULL);
318 if (opt & (MODPROBE_OPT_DUMP_ONLY | MODPROBE_OPT_LIST_ONLY |
319 MODPROBE_OPT_SHOW_ONLY))
320 bb_error_msg_and_die("not supported");
323 if (opt & MODPROBE_OPT_REMOVE) {
324 /* "modprobe -r" (w/o params).
325 * "If name is NULL, all unused modules marked
326 * autoclean will be removed".
328 if (bb_delete_module(NULL, O_NONBLOCK|O_EXCL) != 0)
329 bb_perror_msg_and_die("rmmod");
334 /* Goto modules location */
335 xchdir(CONFIG_DEFAULT_MODULES_DIR);
339 /* Retrieve module names of already loaded modules */
342 parser_t *parser = config_open2("/proc/modules", fopen_for_read);
343 while (config_read(parser, &s, 1, 1, "# \t", PARSE_NORMAL & ~PARSE_GREEDY))
344 get_or_add_modentry(s)->flags |= MODULE_FLAG_LOADED;
345 config_close(parser);
348 if (opt & MODPROBE_OPT_INSERT_ALL) {
349 /* Each argument is a module name */
351 DBG("adding module %s", *argv);
355 /* First argument is module name, rest are parameters */
356 DBG("probing just module %s", *argv);
358 G.cmdline_mopts = parse_cmdline_module_options(argv);
361 /* Happens if all requested modules are already loaded */
362 if (G.probes == NULL)
365 read_config("/etc/modprobe.conf");
366 read_config("/etc/modprobe.d");
367 if (ENABLE_FEATURE_MODUTILS_SYMBOLS && G.need_symbols)
368 read_config("modules.symbols");
370 if (ENABLE_FEATURE_MODUTILS_ALIAS && G.num_unresolved_deps) {
371 read_config("modules.alias");
375 while ((me = llist_pop(&G.probes)) != NULL) {
376 if (me->realnames == NULL) {
377 /* This is not an alias. Literal names are blacklisted
378 * only if '-b' is given.
380 if (!(opt & MODPROBE_OPT_BLACKLIST)
381 || !(me->flags & MODULE_FLAG_BLACKLISTED)
383 rc = do_modprobe(me);
384 //FIXME: what if rc > 0?
385 if (rc < 0 && !(opt & INSMOD_OPT_SILENT))
386 bb_error_msg("module %s not found",
390 /* Probe all realnames */
392 char *realname = llist_pop(&me->realnames);
393 struct module_entry *m2;
395 DBG("probing %s by realname %s", me->modname, realname);
396 m2 = get_or_add_modentry(realname);
397 if (!(m2->flags & MODULE_FLAG_BLACKLISTED))
399 //FIXME: error check?
401 } while (me->realnames != NULL);