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/avl.h>
35 #include <libubox/avl-cmp.h>
36 #include <libubox/utils.h>
37 #include <libubox/ulog.h>
39 #define DEF_MOD_PATH "/modules/%s/"
56 int refcnt; /* number of references from module_node.m */
65 static struct avl_tree modules;
67 static char **module_folders = NULL;
69 static void free_module(struct module *m);
71 static int init_module_folders(void)
76 char *s, *e, *p, path[256], ldpath[256];
79 s = getenv("LD_LIBRARY_PATH");
82 e += snprintf(ldpath, sizeof(ldpath), "%s:", s);
84 e += snprintf(e, sizeof(ldpath) - (e - ldpath), "/lib");
88 for (s = p = ldpath; p <= e; p++) {
89 if (*p != ':' && *p != '\0')
93 snprintf(path, sizeof(path), "%s" DEF_MOD_PATH, s, ver.release);
95 if (!stat(path, &st) && S_ISDIR(st.st_mode)) {
96 module_folders = realloc(module_folders, sizeof(p) * (n + 2));
98 if (!module_folders) {
99 ULOG_ERR("out of memory\n");
103 module_folders[n++] = strdup(path);
112 module_folders[n] = NULL;
116 static struct module *find_module(const char *name)
118 struct module_node *mn;
119 mn = avl_find_element(&modules, name, mn, avl);
126 static void free_modules(void)
128 struct module_node *mn, *tmp;
130 avl_remove_all_elements(&modules, mn, avl, tmp) {
131 struct module *m = mn->m;
140 static char* get_module_path(char *name)
143 static char path[256];
146 if (!stat(name, &s) && S_ISREG(s.st_mode))
149 for (p = module_folders; *p; p++) {
150 snprintf(path, sizeof(path), "%s%s.ko", *p, name);
151 if (!stat(path, &s) && S_ISREG(s.st_mode))
158 static char* get_module_name(char *path)
160 static char name[33];
163 strncpy(name, basename(path), sizeof(name) - 1);
165 t = strstr(name, ".ko");
172 static int elf64_find_section(char *map, const char *section, unsigned int *offset, unsigned int *size)
174 const char *secnames;
179 e = (Elf64_Ehdr *) map;
180 sh = (Elf64_Shdr *) (map + e->e_shoff);
182 secnames = map + sh[e->e_shstrndx].sh_offset;
183 for (i = 0; i < e->e_shnum; i++) {
184 if (!strcmp(section, secnames + sh[i].sh_name)) {
185 *size = sh[i].sh_size;
186 *offset = sh[i].sh_offset;
194 static int elf32_find_section(char *map, const char *section, unsigned int *offset, unsigned int *size)
196 const char *secnames;
201 e = (Elf32_Ehdr *) map;
202 sh = (Elf32_Shdr *) (map + e->e_shoff);
204 secnames = map + sh[e->e_shstrndx].sh_offset;
205 for (i = 0; i < e->e_shnum; i++) {
206 if (!strcmp(section, secnames + sh[i].sh_name)) {
207 *size = sh[i].sh_size;
208 *offset = sh[i].sh_offset;
216 static int elf_find_section(char *map, const char *section, unsigned int *offset, unsigned int *size)
218 int clazz = map[EI_CLASS];
219 int endian = map[EI_DATA];
221 #if __BYTE_ORDER == __LITTLE_ENDIAN
222 if (endian != ELFDATA2LSB)
223 #elif __BYTE_ORDER == __BIG_ENDIAN
224 if (endian != ELFDATA2MSB)
226 #error "unsupported endian"
229 ULOG_ERR("invalid endianess: %d\n", endian);
233 if (clazz == ELFCLASS32)
234 return elf32_find_section(map, section, offset, size);
235 else if (clazz == ELFCLASS64)
236 return elf64_find_section(map, section, offset, size);
238 ULOG_ERR("unknown elf format %d\n", clazz);
243 static struct module_node *
244 alloc_module_node(const char *name, struct module *m, bool is_alias)
246 struct module_node *mn;
249 mn = calloc_a(sizeof(*mn),
250 &_name, strlen(name) + 1);
252 mn->avl.key = strcpy(_name, name);
254 mn->is_alias = is_alias;
255 avl_insert(&modules, &mn->avl);
261 static struct module *
262 alloc_module(const char *name, const char * const *aliases, int naliases, const char *depends, int size)
268 m = calloc_a(sizeof(*m),
269 &_name, strlen(name) + 1,
270 &_dep, depends ? strlen(depends) + 2 : 0);
274 m->name = strcpy(_name, name);
278 m->depends = strcpy(_dep, depends);
288 alloc_module_node(m->name, m, false);
289 for (i = 0; i < naliases; i++)
290 alloc_module_node(aliases[i], m, true);
295 static void free_module(struct module *m)
302 static int scan_loaded_modules(void)
308 fp = fopen("/proc/modules", "r");
310 ULOG_ERR("failed to open /proc/modules\n");
314 while (getline(&buf, &buf_len, fp) > 0) {
318 m.name = strtok(buf, " ");
319 m.size = atoi(strtok(NULL, " "));
320 m.usage = atoi(strtok(NULL, " "));
321 m.depends = strtok(NULL, " ");
323 if (!m.name || !m.depends)
326 n = find_module(m.name);
328 /* possibly a module outside /lib/modules/<ver>/ */
329 n = alloc_module(m.name, NULL, 0, m.depends, m.size);
340 static struct module* get_module_info(const char *module, const char *name)
342 int fd = open(module, O_RDONLY);
343 unsigned int offset, size;
344 char *map = MAP_FAILED, *strings, *dep = NULL;
345 const char **aliases = NULL;
347 struct module *m = NULL;
351 ULOG_ERR("failed to open %s\n", module);
355 if (fstat(fd, &s) == -1) {
356 ULOG_ERR("failed to stat %s\n", module);
360 map = mmap(NULL, s.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
361 if (map == MAP_FAILED) {
362 ULOG_ERR("failed to mmap %s\n", module);
366 if (elf_find_section(map, ".modinfo", &offset, &size)) {
367 ULOG_ERR("failed to load the .modinfo section from %s\n", module);
371 strings = map + offset;
378 if (strings >= map + offset + size)
380 sep = strstr(strings, "=");
385 if (!strncmp(strings, "depends=", len + 1))
387 else if (!strncmp(strings, "alias=", len + 1)) {
388 aliases = realloc(aliases, sizeof(sep) * (naliases + 1));
390 ULOG_ERR("out of memory\n");
394 aliases[naliases++] = sep;
396 strings = &sep[strlen(sep)];
399 m = alloc_module(name, aliases, naliases, dep, s.st_size);
405 if (map != MAP_FAILED)
406 munmap(map, s.st_size);
416 static int scan_module_folder(const char *dir)
418 int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
425 path = alloca(strlen(dir) + sizeof("*.ko") + 1);
426 sprintf(path, "%s*.ko", dir);
428 if (glob(path, gl_flags, NULL, &gl) < 0)
431 for (j = 0; j < gl.gl_pathc; j++) {
432 char *name = get_module_name(gl.gl_pathv[j]);
438 m = find_module(name);
440 if (!get_module_info(gl.gl_pathv[j], name))
450 static int scan_module_folders(void)
455 if (init_module_folders())
458 for (p = module_folders; *p; p++)
459 rv |= scan_module_folder(*p);
464 static int print_modinfo(char *module)
466 int fd = open(module, O_RDONLY);
467 unsigned int offset, size;
469 char *map = MAP_FAILED, *strings;
473 ULOG_ERR("failed to open %s\n", module);
477 if (fstat(fd, &s) == -1) {
478 ULOG_ERR("failed to stat %s\n", module);
482 map = mmap(NULL, s.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
483 if (map == MAP_FAILED) {
484 ULOG_ERR("failed to mmap %s\n", module);
488 if (elf_find_section(map, ".modinfo", &offset, &size)) {
489 ULOG_ERR("failed to load the .modinfo section from %s\n", module);
493 strings = map + offset;
494 printf("module:\t\t%s\n", module);
501 if (strings >= map + offset + size)
503 sep = strstr(strings, "=");
506 dup = strndup(strings, sep - strings);
508 if (strncmp(strings, "parm", 4)) {
510 printf("%s:\t\t%s\n", dup, sep);
512 printf("%s:\t%s\n", dup, sep);
514 strings = &sep[strlen(sep)];
522 if (map != MAP_FAILED)
523 munmap(map, s.st_size);
531 static int deps_available(struct module *m, int verbose)
536 if (!m->depends || !strcmp(m->depends, "-") || !strcmp(m->depends, ""))
542 m = find_module(dep);
545 ULOG_ERR("missing dependency %s\n", dep);
546 if (verbose && m && (m->state != LOADED))
547 ULOG_ERR("dependency not loaded %s\n", dep);
548 if (!m || (m->state != LOADED))
550 dep += strlen(dep) + 1;
556 static int insert_module(char *path, const char *options)
562 if (stat(path, &s)) {
563 ULOG_ERR("missing module %s\n", path);
567 fd = open(path, O_RDONLY);
569 ULOG_ERR("cannot open %s\n", path);
573 data = malloc(s.st_size);
575 ULOG_ERR("out of memory\n");
579 if (read(fd, data, s.st_size) == s.st_size) {
580 ret = syscall(__NR_init_module, data, (unsigned long) s.st_size, options);
585 ULOG_ERR("failed to read full module %s\n", path);
594 static void load_moddeps(struct module *_m)
599 if (!strcmp(_m->depends, "-") || !strcmp(_m->depends, ""))
605 m = find_module(dep);
608 ULOG_ERR("failed to find dependency %s\n", dep);
609 if (m && (m->state != LOADED)) {
614 dep = dep + strlen(dep) + 1;
618 static int iterations = 0;
619 static int load_modprobe(void)
622 struct module_node *mn;
625 avl_for_each_element(&modules, mn, avl) {
629 if (m->state == PROBE)
636 avl_for_each_element(&modules, mn, avl) {
640 if ((m->state == PROBE) && (!deps_available(m, 0))) {
641 if (!insert_module(get_module_path(m->name), (m->opts) ? (m->opts) : (""))) {
650 if ((m->state == PROBE) || m->error)
659 static int print_insmod_usage(void)
661 ULOG_INFO("Usage:\n\tinsmod filename [args]\n");
666 static int print_modprobe_usage(void)
668 ULOG_INFO("Usage:\n\tmodprobe [-q] filename\n");
673 static int print_usage(char *arg)
675 ULOG_INFO("Usage:\n\t%s module\n", arg);
680 static int main_insmod(int argc, char **argv)
682 char *name, *cur, *options;
686 return print_insmod_usage();
688 name = get_module_name(argv[1]);
690 ULOG_ERR("cannot find module - %s\n", argv[1]);
694 if (scan_loaded_modules())
697 if (find_module(name)) {
698 ULOG_ERR("module is already loaded - %s\n", name);
705 for (len = 0, i = 2; i < argc; i++)
706 len += strlen(argv[i]) + 1;
708 options = malloc(len);
710 ULOG_ERR("out of memory\n");
717 for (i = 2; i < argc; i++) {
722 cur += sprintf(cur, "%s", argv[i]);
725 if (init_module_folders()) {
726 fprintf(stderr, "Failed to find the folder holding the modules\n");
731 if (get_module_path(argv[1])) {
733 } else if (!get_module_path(name)) {
734 fprintf(stderr, "Failed to find %s. Maybe it is a built in module ?\n", name);
739 ret = insert_module(get_module_path(name), options);
741 ULOG_ERR("failed to insert %s\n", get_module_path(name));
748 static int main_rmmod(int argc, char **argv)
755 return print_usage("rmmod");
757 if (scan_loaded_modules())
760 name = get_module_name(argv[1]);
761 m = find_module(name);
763 ULOG_ERR("module is not loaded\n");
766 ret = syscall(__NR_delete_module, m->name, 0);
769 ULOG_ERR("unloading the module failed\n");
776 static int main_lsmod(int argc, char **argv)
778 struct module_node *mn;
782 if (scan_loaded_modules())
785 avl_for_each_element(&modules, mn, avl) {
789 if (m->state == LOADED) {
790 printf("%-20s%8d%3d ",
791 m->name, m->size, m->usage);
792 if (m->depends && strcmp(m->depends, "-") && strcmp(m->depends, "")) {
796 dep = dep + strlen(dep) + 1;
810 static int main_modinfo(int argc, char **argv)
816 return print_usage("modinfo");
818 if (scan_module_folders())
821 name = get_module_name(argv[1]);
822 m = find_module(name);
824 ULOG_ERR("cannot find module - %s\n", argv[1]);
828 name = get_module_path(m->name);
830 ULOG_ERR("cannot find path of module - %s\n", m->name);
839 static int main_modprobe(int argc, char **argv)
841 struct module_node *mn;
848 while ((opt = getopt(argc, argv, "q")) != -1 ) {
850 case 'q': /* shhhh! */
854 return print_modprobe_usage();
860 return print_modprobe_usage(); /* expected module after options */
864 if (scan_module_folders())
867 if (scan_loaded_modules())
870 name = get_module_name(mod);
871 m = find_module(name);
872 if (m && m->state == LOADED) {
874 ULOG_ERR("%s is already loaded\n", name);
878 ULOG_ERR("failed to find a module named %s\n", name);
885 fail = load_modprobe();
888 ULOG_ERR("%d module%s could not be probed\n",
889 fail, (fail == 1) ? ("") : ("s"));
891 avl_for_each_element(&modules, mn, avl) {
895 if ((m->state == PROBE) || m->error)
896 ULOG_ERR("- %s\n", m->name);
906 static int main_loader(int argc, char **argv)
908 int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
909 char *dir = "/etc/modules.d/";
910 struct module_node *mn;
919 path = malloc(strlen(dir) + 2);
921 ULOG_ERR("out of memory\n");
928 if (scan_module_folders()) {
933 if (scan_loaded_modules()) {
938 ULOG_INFO("loading kernel modules from %s\n", path);
940 if (glob(path, gl_flags, NULL, &gl) < 0)
943 for (j = 0; j < gl.gl_pathc; j++) {
944 FILE *fp = fopen(gl.gl_pathv[j], "r");
949 ULOG_ERR("failed to open %s\n", gl.gl_pathv[j]);
953 while (getline(&mod, &mod_len, fp) > 0) {
954 char *nl = strchr(mod, '\n');
961 opts = strchr(mod, ' ');
965 m = find_module(get_module_name(mod));
966 if (!m || (m->state == LOADED))
970 m->opts = strdup(opts);
972 if (basename(gl.gl_pathv[j])[0] - '0' <= 9)
980 fail = load_modprobe();
983 ULOG_ERR("%d module%s could not be probed\n",
984 fail, (fail == 1) ? ("") : ("s"));
986 avl_for_each_element(&modules, mn, avl) {
990 if ((m->state == PROBE) || (m->error))
991 ULOG_ERR("- %s - %d\n", m->name, deps_available(m, 1));
994 ULOG_INFO("done loading kernel modules from %s\n", path);
1004 static inline char weight(char c)
1006 return c == '_' ? '-' : c;
1009 static int avl_modcmp(const void *k1, const void *k2, void *ptr)
1011 const char *s1 = k1;
1012 const char *s2 = k2;
1014 while (*s1 && (weight(*s1) == weight(*s2)))
1020 return (unsigned char)weight(*s1) - (unsigned char)weight(*s2);
1023 int main(int argc, char **argv)
1025 char *exec = basename(*argv);
1027 avl_init(&modules, avl_modcmp, false, NULL);
1028 if (!strcmp(exec, "insmod"))
1029 return main_insmod(argc, argv);
1031 if (!strcmp(exec, "rmmod"))
1032 return main_rmmod(argc, argv);
1034 if (!strcmp(exec, "lsmod"))
1035 return main_lsmod(argc, argv);
1037 if (!strcmp(exec, "modinfo"))
1038 return main_modinfo(argc, argv);
1040 if (!strcmp(exec, "modprobe"))
1041 return main_modprobe(argc, argv);
1043 ulog_open(ULOG_KMSG, LOG_USER, "kmodloader");
1044 return main_loader(argc, argv);