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>
35 #include <libubox/avl.h>
36 #include <libubox/avl-cmp.h>
37 #include <libubox/utils.h>
39 #define DEF_MOD_PATH "/lib/modules/%s/"
41 #define INFO(fmt, ...) do { \
42 syslog(LOG_INFO, fmt, ## __VA_ARGS__); \
43 printf("kmod: "fmt, ## __VA_ARGS__); \
45 #define ERROR(fmt, ...) do { \
46 syslog(LOG_ERR, fmt, ## __VA_ARGS__); \
47 fprintf(stderr,"kmod: "fmt, ## __VA_ARGS__); \
49 #define DEBUG(fmt, ...) do { \
50 syslog(LOG_DEBUG, fmt, ## __VA_ARGS__); \
73 static struct avl_tree modules;
74 static char *prefix = "";
76 static struct module *find_module(const char *name)
79 return avl_find_element(&modules, name, m, avl);
82 static void free_modules(void)
84 struct module *m, *tmp;
86 avl_remove_all_elements(&modules, m, avl, tmp)
90 static char* get_module_path(char *name)
92 static char path[256];
100 snprintf(path, 256, "%s" DEF_MOD_PATH "%s.ko", prefix, ver.release, name);
108 static char* get_module_name(char *path)
110 static char name[32];
113 strncpy(name, basename(path), sizeof(name));
115 t = strstr(name, ".ko");
122 static int elf64_find_section(char *map, const char *section, unsigned int *offset, unsigned int *size)
124 const char *secnames;
129 e = (Elf64_Ehdr *) map;
130 sh = (Elf64_Shdr *) (map + e->e_shoff);
132 secnames = map + sh[e->e_shstrndx].sh_offset;
133 for (i = 0; i < e->e_shnum; i++) {
134 if (!strcmp(section, secnames + sh[i].sh_name)) {
135 *size = sh[i].sh_size;
136 *offset = sh[i].sh_offset;
144 static int elf32_find_section(char *map, const char *section, unsigned int *offset, unsigned int *size)
146 const char *secnames;
151 e = (Elf32_Ehdr *) map;
152 sh = (Elf32_Shdr *) (map + e->e_shoff);
154 secnames = map + sh[e->e_shstrndx].sh_offset;
155 for (i = 0; i < e->e_shnum; i++) {
156 if (!strcmp(section, secnames + sh[i].sh_name)) {
157 *size = sh[i].sh_size;
158 *offset = sh[i].sh_offset;
166 static int elf_find_section(char *map, const char *section, unsigned int *offset, unsigned int *size)
168 int clazz = map[EI_CLASS];
170 if (clazz == ELFCLASS32)
171 return elf32_find_section(map, section, offset, size);
172 else if (clazz == ELFCLASS64)
173 return elf64_find_section(map, section, offset, size);
175 ERROR("unknown elf format %d\n", clazz);
180 static struct module *
181 alloc_module(const char *name, const char *depends, int size)
186 m = calloc_a(sizeof(*m),
187 &_name, strlen(name) + 1,
188 &_dep, depends ? strlen(depends) + 2 : 0);
192 m->avl.key = m->name = strcpy(_name, name);
196 m->depends = strcpy(_dep, depends);
205 avl_insert(&modules, &m->avl);
210 static int scan_loaded_modules(void)
216 fp = fopen("/proc/modules", "r");
218 ERROR("failed to open /proc/modules\n");
222 while (getline(&buf, &buf_len, fp) > 0) {
226 m.name = strtok(buf, " ");
227 m.size = atoi(strtok(NULL, " "));
228 m.usage = atoi(strtok(NULL, " "));
229 m.depends = strtok(NULL, " ");
231 if (!m.name || !m.depends)
234 n = alloc_module(m.name, m.depends, m.size);
244 static struct module* get_module_info(const char *module, const char *name)
246 int fd = open(module, O_RDONLY);
247 unsigned int offset, size;
248 char *map, *strings, *dep = NULL;
253 ERROR("failed to open %s\n", module);
257 if (fstat(fd, &s) == -1) {
258 ERROR("failed to stat %s\n", module);
262 map = mmap(NULL, s.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
263 if (map == MAP_FAILED) {
264 ERROR("failed to mmap %s\n", module);
268 if (elf_find_section(map, ".modinfo", &offset, &size)) {
269 ERROR("failed to load the .modinfo section from %s\n", module);
273 strings = map + offset;
274 while (strings && (strings < map + offset + size)) {
280 sep = strstr(strings, "=");
285 if (!strncmp(strings, "depends=", len + 1))
287 strings = &sep[strlen(sep)];
290 m = alloc_module(name, dep, s.st_size);
299 static int scan_module_folder(void)
301 int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
308 path = alloca(sizeof(DEF_MOD_PATH "*.ko") + strlen(prefix) + strlen(ver.release) + 1);
309 sprintf(path, "%s" DEF_MOD_PATH "*.ko", prefix, ver.release);
311 if (glob(path, gl_flags, NULL, &gl) < 0)
314 for (j = 0; j < gl.gl_pathc; j++) {
315 char *name = get_module_name(gl.gl_pathv[j]);
321 m = find_module(name);
323 get_module_info(gl.gl_pathv[j], name);
331 static int print_modinfo(char *module)
333 int fd = open(module, O_RDONLY);
334 unsigned int offset, size;
339 ERROR("failed to open %s\n", module);
343 if (fstat(fd, &s) == -1) {
344 ERROR("failed to stat %s\n", module);
348 map = mmap(NULL, s.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
349 if (map == MAP_FAILED) {
350 ERROR("failed to mmap %s\n", module);
354 if (elf_find_section(map, ".modinfo", &offset, &size)) {
355 ERROR("failed to load the .modinfo section from %s\n", module);
359 strings = map + offset;
360 printf("module:\t\t%s\n", module);
361 while (strings && (strings < map + offset + size)) {
367 sep = strstr(strings, "=");
370 dup = strndup(strings, sep - strings);
372 if (strncmp(strings, "parm", 4)) {
374 printf("%s:\t\t%s\n", dup, sep);
376 printf("%s:\t%s\n", dup, sep);
378 strings = &sep[strlen(sep)];
386 static int deps_available(struct module *m, int verbose)
391 if (!strcmp(m->depends, "-") || !strcmp(m->depends, ""))
397 m = find_module(dep);
400 ERROR("missing dependency %s\n", dep);
401 if (verbose && m && (m->state != LOADED))
402 ERROR("dependency not loaded %s\n", dep);
403 if (!m || (m->state != LOADED))
405 dep += strlen(dep) + 1;
411 static int insert_module(char *path, const char *options)
417 if (stat(path, &s)) {
418 ERROR("missing module %s\n", path);
422 fd = open(path, O_RDONLY);
424 ERROR("cannot open %s\n", path);
428 data = malloc(s.st_size);
429 if (read(fd, data, s.st_size) == s.st_size)
430 ret = syscall(__NR_init_module, data, (unsigned long) s.st_size, options);
432 ERROR("failed to read full module %s\n", path);
440 static void load_moddeps(struct module *_m)
445 if (!strcmp(_m->depends, "-") || !strcmp(_m->depends, ""))
451 m = find_module(dep);
454 ERROR("failed to find dependency %s\n", dep);
455 if (m && (m->state != LOADED)) {
460 dep = dep + strlen(dep) + 1;
464 static int iterations = 0;
465 static int load_modprobe(void)
470 avl_for_each_element(&modules, m, avl)
471 if (m->state == PROBE)
477 avl_for_each_element(&modules, m, avl) {
478 if ((m->state == PROBE) && (!deps_available(m, 0))) {
479 if (!insert_module(get_module_path(m->name), (m->opts) ? (m->opts) : (""))) {
488 if ((m->state == PROBE) || m->error)
497 static int print_insmod_usage(void)
499 INFO("Usage:\n\tinsmod filename [args]\n");
504 static int print_usage(char *arg)
506 INFO("Usage:\n\t%s module\n", arg);
511 static int main_insmod(int argc, char **argv)
513 char *name, *cur, *options;
517 return print_insmod_usage();
519 name = get_module_name(argv[1]);
521 ERROR("cannot find module - %s\n", argv[1]);
525 if (scan_loaded_modules())
528 if (find_module(name)) {
529 ERROR("module is already loaded - %s\n", name);
536 for (len = 0, i = 2; i < argc; i++)
537 len += strlen(argv[i]) + 1;
539 options = malloc(len);
542 for (i = 2; i < argc; i++) {
547 cur += sprintf(cur, "%s", argv[i]);
550 if (get_module_path(argv[1])) {
552 } else if (!get_module_path(name)) {
553 fprintf(stderr, "Failed to find %s. Maybe it is a built in module ?\n", name);
557 ret = insert_module(get_module_path(name), options);
561 ERROR("failed to insert %s\n", get_module_path(name));
566 static int main_rmmod(int argc, char **argv)
573 return print_usage("rmmod");
575 if (scan_loaded_modules())
578 name = get_module_name(argv[1]);
579 m = find_module(name);
581 ERROR("module is not loaded\n");
584 ret = syscall(__NR_delete_module, m->name, 0);
587 ERROR("unloading the module failed\n");
594 static int main_lsmod(int argc, char **argv)
598 if (scan_loaded_modules())
601 avl_for_each_element(&modules, m, avl)
602 if (m->state == LOADED)
603 printf("%-20s%8d%3d %s\n",
604 m->name, m->size, m->usage,
605 (*m->depends == '-') ? ("") : (m->depends));
612 static int main_modinfo(int argc, char **argv)
618 return print_usage("modinfo");
620 if (scan_module_folder())
623 name = get_module_name(argv[1]);
624 m = find_module(name);
626 ERROR("cannot find module - %s\n", argv[1]);
630 name = get_module_path(m->name);
632 ERROR("cannot find path of module - %s\n", m->name);
641 static int main_modprobe(int argc, char **argv)
647 return print_usage("modprobe");
649 if (scan_loaded_modules())
652 if (scan_module_folder())
655 name = get_module_name(argv[1]);
656 m = find_module(name);
657 if (m && m->state == LOADED) {
658 ERROR("%s is already loaded\n", name);
661 ERROR("failed to find a module named %s\n", name);
667 fail = load_modprobe();
670 ERROR("%d module%s could not be probed\n",
671 fail, (fail == 1) ? ("") : ("s"));
673 avl_for_each_element(&modules, m, avl)
674 if ((m->state == PROBE) || m->error)
675 ERROR("- %s\n", m->name);
684 static int main_loader(int argc, char **argv)
686 int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
687 char *dir = "/etc/modules.d/*";
699 path = malloc(strlen(dir) + 2);
703 if (scan_loaded_modules())
706 if (scan_module_folder())
709 syslog(0, "kmodloader: loading kernel modules from %s\n", path);
711 if (glob(path, gl_flags, NULL, &gl) < 0)
714 for (j = 0; j < gl.gl_pathc; j++) {
715 FILE *fp = fopen(gl.gl_pathv[j], "r");
720 ERROR("failed to open %s\n", gl.gl_pathv[j]);
724 while (getline(&mod, &mod_len, fp) > 0) {
725 char *nl = strchr(mod, '\n');
732 opts = strchr(mod, ' ');
736 m = find_module(get_module_name(mod));
737 if (!m || (m->state == LOADED))
741 m->opts = strdup(opts);
743 if (basename(gl.gl_pathv[j])[0] - '0' <= 9)
751 fail = load_modprobe();
752 DEBUG("ran %d iterations\n", iterations);
755 ERROR("%d module%s could not be probed\n",
756 fail, (fail == 1) ? ("") : ("s"));
758 avl_for_each_element(&modules, m, avl)
759 if ((m->state == PROBE) || (m->error))
760 ERROR("- %s - %d\n", m->name, deps_available(m, 1));
770 static int avl_modcmp(const void *k1, const void *k2, void *ptr)
775 while (*s1 && ((*s1 == *s2) ||
776 ((*s1 == '_') && (*s2 == '-')) ||
777 ((*s1 == '-') && (*s2 == '_'))))
783 return *(const unsigned char *)s1 - *(const unsigned char *)s2;
786 int main(int argc, char **argv)
788 char *exec = basename(*argv);
790 avl_init(&modules, avl_modcmp, false, NULL);
791 if (!strcmp(exec, "insmod"))
792 return main_insmod(argc, argv);
794 if (!strcmp(exec, "rmmod"))
795 return main_rmmod(argc, argv);
797 if (!strcmp(exec, "lsmod"))
798 return main_lsmod(argc, argv);
800 if (!strcmp(exec, "modinfo"))
801 return main_modinfo(argc, argv);
803 if (!strcmp(exec, "modprobe"))
804 return main_modprobe(argc, argv);
806 return main_loader(argc, argv);