2 * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
3 * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU Lesser General Public License version 2.1
7 * as published by the Free Software Foundation
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
16 #include <sys/syscall.h>
18 #include <sys/utsname.h>
22 #include <sys/syscall.h>
23 #include <sys/types.h>
34 #include <libubox/list.h>
36 #define DEF_MOD_PATH "/lib/modules/%s/"
46 struct list_head list;
56 static LIST_HEAD(modules);
58 static struct module* find_module(char *name)
60 struct module *m = NULL;
62 list_for_each_entry(m, &modules, list)
63 if (!strcmp(m->name, name))
68 static void free_module(struct module *m)
77 static void free_modules(void)
79 struct list_head *p, *n;
81 list_for_each_safe(p, n, &modules) {
82 struct module *m = container_of(p, struct module, list);
88 static char* get_module_path(char *name)
90 static char path[256];
99 snprintf(path, 256, DEF_MOD_PATH "%s.ko", ver.release, name);
111 snprintf(path, 256, DEF_MOD_PATH "%s.ko", ver.release, name);
119 static char* get_module_name(char *path)
121 static char name[32];
124 strncpy(name, basename(path), sizeof(name));
126 t = strstr(name, ".ko");
140 static int elf_find_section(char *map, const char *section, unsigned int *offset, unsigned int *size)
142 const char *secnames;
147 e = (Elf64_Ehdr *) map;
148 sh = (Elf64_Shdr *) (map + e->e_shoff);
150 secnames = map + sh[e->e_shstrndx].sh_offset;
151 for (i = 0; i < e->e_shnum; i++) {
152 if (!strcmp(section, secnames + sh[i].sh_name)) {
153 *size = sh[i].sh_size;
154 *offset = sh[i].sh_offset;
162 static int elf_find_section(char *map, const char *section, unsigned int *offset, unsigned int *size)
164 const char *secnames;
169 e = (Elf32_Ehdr *) map;
170 sh = (Elf32_Shdr *) (map + e->e_shoff);
172 secnames = map + sh[e->e_shstrndx].sh_offset;
173 for (i = 0; i < e->e_shnum; i++) {
174 if (!strcmp(section, secnames + sh[i].sh_name)) {
175 *size = sh[i].sh_size;
176 *offset = sh[i].sh_offset;
185 static int scan_loaded_modules(void)
187 FILE *fp = fopen("/proc/modules", "r");
191 fprintf(stderr, "failed to open /proc/modules\n");
195 while (fgets(buf, sizeof(buf), fp)) {
199 m.name = strtok(buf, " ");
200 m.size = atoi(strtok(NULL, " "));
201 m.usage = atoi(strtok(NULL, " "));
202 m.depends = strtok(NULL, " ");
204 if (!m.name || !m.depends)
207 n = malloc(sizeof(struct module));
211 n->name = strdup(m.name);
212 n->depends = strdup(m.depends);
217 list_add_tail(&n->list, &modules);
223 static struct module* get_module_info(char *module)
225 int fd = open(module, O_RDONLY);
226 unsigned int offset, size;
232 fprintf(stderr, "failed to open %s\n", module);
236 if (fstat(fd, &s) == -1) {
237 fprintf(stderr, "failed to stat %s\n", module);
241 map = mmap(NULL, s.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
242 if (map == MAP_FAILED) {
243 fprintf(stderr, "failed to mmap %s\n", module);
247 if (elf_find_section(map, ".modinfo", &offset, &size)) {
248 fprintf(stderr, "failed to load the .modinfo section from %s\n", module);
252 strings = map + offset;
253 m = malloc(sizeof(struct module));
257 memset(m, 0, sizeof(struct module));
259 while (strings && (strings < map + offset + size)) {
265 sep = strstr(strings, "=");
270 if (!strncmp(strings, "depends=", len + 1))
271 m->depends = strdup(sep);
272 strings = &sep[strlen(sep)];
280 static int scan_module_folder(char *dir)
282 int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
286 if (glob(dir, gl_flags, NULL, &gl) < 0)
289 for (j = 0; j < gl.gl_pathc; j++) {
290 char *name = get_module_name(gl.gl_pathv[j]);
296 m = find_module(name);
298 m = get_module_info(gl.gl_pathv[j]);
299 m->name = strdup(name);
300 list_add_tail(&m->list, &modules);
309 static int print_modinfo(char *module)
311 int fd = open(module, O_RDONLY);
312 unsigned int offset, size;
317 fprintf(stderr, "failed to open %s\n", module);
321 if (fstat(fd, &s) == -1) {
322 fprintf(stderr, "failed to stat %s\n", module);
326 map = mmap(NULL, s.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
327 if (map == MAP_FAILED) {
328 fprintf(stderr, "failed to mmap %s\n", module);
332 if (elf_find_section(map, ".modinfo", &offset, &size)) {
333 fprintf(stderr, "failed to load the .modinfo section from %s\n", module);
337 strings = map + offset;
338 printf("module:\t\t%s\n", module);
339 while (strings && (strings < map + offset + size)) {
345 sep = strstr(strings, "=");
348 dup = strndup(strings, sep - strings);
350 if (strncmp(strings, "parm", 4)) {
352 printf("%s:\t\t%s\n", dup, sep);
354 printf("%s:\t%s\n", dup, sep);
356 strings = &sep[strlen(sep)];
364 static int insert_module(char *path, const char *options)
370 if (stat(path, &s)) {
371 fprintf(stderr, "missing module %s\n", path);
375 fd = open(path, O_RDONLY);
377 fprintf(stderr, "cannot open %s\n", path);
381 data = malloc(s.st_size);
382 if (read(fd, data, s.st_size) == s.st_size) {
383 ret = syscall(__NR_init_module, data, s.st_size, options);
385 fprintf(stderr, "failed to insert %s\n", path);
387 fprintf(stderr, "failed to read full module %s\n", path);
396 static int deps_available(struct module *m)
398 char *deps = m->depends;
401 if (!strcmp(deps, "-"))
403 while (*deps && (NULL != ((comma = strstr(deps, ","))))) {
406 m = find_module(deps);
408 if (!m || (m->state != LOADED))
417 static int load_depmod(void)
425 list_for_each_entry(m, &modules, list) {
426 if ((m->state == PROBE) && (!deps_available(m))) {
427 if (!insert_module(get_module_path(m->name), "")) {
433 } else if (m->state == PROBE) {
437 // printf("loaded %d modules this pass\n", loaded);
440 // printf("missing todos %d\n", todo);
445 static int print_insmod_usage(void)
447 fprintf(stderr, "Usage:\n\tinsmod filename [args]\n");
452 static int print_usage(char *arg)
454 fprintf(stderr, "Usage:\n\t%s module\n", arg);
459 static int main_insmod(int argc, char **argv)
461 char options[256] = "";
466 return print_insmod_usage();
468 name = get_module_name(argv[1]);
470 fprintf(stderr, "cannot find module - %s\n", argv[1]);
474 if (scan_loaded_modules())
477 if (find_module(name)) {
478 fprintf(stderr, "module is already loaded - %s\n", name);
485 for (i = 2; i < argc; i++)
486 if (snprintf(options, sizeof(options), "%s %s", options, argv[i]) >= sizeof(options)) {
487 fprintf(stderr, "argument line too long - %s\n", options);
491 return insert_module(get_module_path(name), options);
494 static int main_rmmod(int argc, char **argv)
501 return print_usage("rmmod");
503 if (scan_loaded_modules())
506 name = get_module_name(argv[1]);
507 m = find_module(name);
509 fprintf(stderr, "module is not loaded\n");
514 ret = syscall(__NR_delete_module, name, 0);
517 fprintf(stderr, "unloading the module failed\n");
522 static int main_lsmod(int argc, char **argv)
526 if (scan_loaded_modules())
529 list_for_each_entry(m, &modules, list)
530 if (m->state == LOADED)
531 printf("%-20s%8d%3d %s\n",
532 m->name, m->size, m->usage,
533 (*m->depends == '-') ? ("") : (m->depends));
540 static int main_modinfo(int argc, char **argv)
545 return print_usage("modinfo");
547 module = get_module_path(argv[1]);
549 fprintf(stderr, "cannot find module - %s\n", argv[1]);
553 print_modinfo(module);
558 static int main_depmod(int argc, char **argv)
566 return print_usage("depmod");
568 if (scan_loaded_modules())
572 snprintf(path, sizeof(path), DEF_MOD_PATH "*.ko", ver.release);
574 scan_module_folder(path);
576 name = get_module_name(argv[1]);
577 m = find_module(name);
578 if (m && m->state == LOADED) {
579 fprintf(stderr, "%s is already loaded\n", name);
582 fprintf(stderr, "failed to find a module named %s\n", name);
593 static int main_loader(int argc, char **argv)
595 int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
596 char *dir = "/etc/modules.d/*";
603 path = malloc(strlen(dir) + 2);
607 scan_loaded_modules();
609 syslog(0, "kmodloader: loading kernel modules from %s\n", path);
611 if (glob(path, gl_flags, NULL, &gl) >= 0) {
614 for (j = 0; j < gl.gl_pathc; j++) {
615 FILE *fp = fopen(gl.gl_pathv[j], "r");
618 fprintf(stderr, "failed to open %s\n", gl.gl_pathv[j]);
622 while (fgets(mod, sizeof(mod), fp)) {
623 char *nl = strchr(mod, '\n');
630 opts = strchr(mod, ' ');
634 m = find_module(get_module_name(mod));
637 insert_module(get_module_path(mod), (opts) ? (opts) : (""));
650 int main(int argc, char **argv)
652 char *exec = basename(*argv);
654 if (!strcmp(exec, "insmod"))
655 return main_insmod(argc, argv);
657 if (!strcmp(exec, "rmmod"))
658 return main_rmmod(argc, argv);
660 if (!strcmp(exec, "lsmod"))
661 return main_lsmod(argc, argv);
663 if (!strcmp(exec, "modinfo"))
664 return main_modinfo(argc, argv);
666 if (!strcmp(exec, "depmod"))
667 return main_depmod(argc, argv);
669 return main_loader(argc, argv);