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 LOG(fmt, ...) do { \
42 syslog(LOG_INFO, fmt, ## __VA_ARGS__); \
43 printf("kmod: "fmt, ## __VA_ARGS__); \
66 static struct avl_tree modules;
67 static char *prefix = "";
69 static struct module *find_module(const char *name)
72 return avl_find_element(&modules, name, m, avl);
75 static void free_modules(void)
77 struct module *m, *tmp;
79 avl_remove_all_elements(&modules, m, avl, tmp)
83 static char* get_module_path(char *name)
85 static char path[256];
93 snprintf(path, 256, "%s" DEF_MOD_PATH "%s.ko", prefix, ver.release, name);
101 static char* get_module_name(char *path)
103 static char name[32];
106 strncpy(name, basename(path), sizeof(name));
108 t = strstr(name, ".ko");
116 static int elf_find_section(char *map, const char *section, unsigned int *offset, unsigned int *size)
118 const char *secnames;
123 e = (Elf64_Ehdr *) map;
124 sh = (Elf64_Shdr *) (map + e->e_shoff);
126 secnames = map + sh[e->e_shstrndx].sh_offset;
127 for (i = 0; i < e->e_shnum; i++) {
128 if (!strcmp(section, secnames + sh[i].sh_name)) {
129 *size = sh[i].sh_size;
130 *offset = sh[i].sh_offset;
138 static int elf_find_section(char *map, const char *section, unsigned int *offset, unsigned int *size)
140 const char *secnames;
145 e = (Elf32_Ehdr *) map;
146 sh = (Elf32_Shdr *) (map + e->e_shoff);
148 secnames = map + sh[e->e_shstrndx].sh_offset;
149 for (i = 0; i < e->e_shnum; i++) {
150 if (!strcmp(section, secnames + sh[i].sh_name)) {
151 *size = sh[i].sh_size;
152 *offset = sh[i].sh_offset;
161 static struct module *
162 alloc_module(const char *name, const char *depends, int size)
167 m = calloc_a(sizeof(*m),
168 &_name, strlen(name) + 1,
169 &_dep, depends ? strlen(depends) + 2 : 0);
173 m->avl.key = m->name = strcpy(_name, name);
176 m->depends = strcpy(_dep, depends);
185 avl_insert(&modules, &m->avl);
190 static int scan_loaded_modules(void)
196 fp = fopen("/proc/modules", "r");
198 LOG("failed to open /proc/modules\n");
202 while (getline(&buf, &buf_len, fp) > 0) {
206 m.name = strtok(buf, " ");
207 m.size = atoi(strtok(NULL, " "));
208 m.usage = atoi(strtok(NULL, " "));
209 m.depends = strtok(NULL, " ");
211 if (!m.name || !m.depends)
214 n = alloc_module(m.name, m.depends, m.size);
224 static struct module* get_module_info(const char *module, const char *name)
226 int fd = open(module, O_RDONLY);
227 unsigned int offset, size;
228 char *map, *strings, *dep = NULL;
233 LOG("failed to open %s\n", module);
237 if (fstat(fd, &s) == -1) {
238 LOG("failed to stat %s\n", module);
242 map = mmap(NULL, s.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
243 if (map == MAP_FAILED) {
244 LOG("failed to mmap %s\n", module);
248 if (elf_find_section(map, ".modinfo", &offset, &size)) {
249 LOG("failed to load the .modinfo section from %s\n", module);
253 strings = map + offset;
254 while (strings && (strings < map + offset + size)) {
260 sep = strstr(strings, "=");
265 if (!strncmp(strings, "depends=", len + 1))
267 strings = &sep[strlen(sep)];
270 m = alloc_module(name, dep, s.st_size);
279 static int scan_module_folder(void)
281 int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
288 path = alloca(sizeof(DEF_MOD_PATH "*.ko") + strlen(prefix) + strlen(ver.release) + 1);
289 sprintf(path, "%s" DEF_MOD_PATH "*.ko", prefix, ver.release);
291 if (glob(path, gl_flags, NULL, &gl) < 0)
294 for (j = 0; j < gl.gl_pathc; j++) {
295 char *name = get_module_name(gl.gl_pathv[j]);
301 m = find_module(name);
303 get_module_info(gl.gl_pathv[j], name);
311 static int print_modinfo(char *module)
313 int fd = open(module, O_RDONLY);
314 unsigned int offset, size;
319 LOG("failed to open %s\n", module);
323 if (fstat(fd, &s) == -1) {
324 LOG("failed to stat %s\n", module);
328 map = mmap(NULL, s.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
329 if (map == MAP_FAILED) {
330 LOG("failed to mmap %s\n", module);
334 if (elf_find_section(map, ".modinfo", &offset, &size)) {
335 LOG("failed to load the .modinfo section from %s\n", module);
339 strings = map + offset;
340 printf("module:\t\t%s\n", module);
341 while (strings && (strings < map + offset + size)) {
347 sep = strstr(strings, "=");
350 dup = strndup(strings, sep - strings);
352 if (strncmp(strings, "parm", 4)) {
354 printf("%s:\t\t%s\n", dup, sep);
356 printf("%s:\t%s\n", dup, sep);
358 strings = &sep[strlen(sep)];
366 static int deps_available(struct module *m, int verbose)
371 if (!strcmp(m->depends, "-") || !strcmp(m->depends, ""))
377 m = find_module(dep);
380 LOG("missing dependency %s\n", dep);
381 if (verbose && m && (m->state != LOADED))
382 LOG("dependency not loaded %s\n", dep);
383 if (!m || (m->state != LOADED))
385 dep += strlen(dep) + 1;
391 static int insert_module(char *path, const char *options)
397 if (stat(path, &s)) {
398 LOG("missing module %s\n", path);
402 fd = open(path, O_RDONLY);
404 LOG("cannot open %s\n", path);
408 data = malloc(s.st_size);
409 if (read(fd, data, s.st_size) == s.st_size)
410 ret = syscall(__NR_init_module, data, s.st_size, options);
412 LOG("failed to read full module %s\n", path);
420 static void load_moddeps(struct module *_m)
425 if (!strcmp(_m->depends, "-") || !strcmp(_m->depends, ""))
431 m = find_module(dep);
434 LOG("failed to find dependency %s\n", dep);
435 if (m && (m->state != LOADED)) {
440 dep = dep + strlen(dep) + 1;
444 static int iterations = 0;
445 static int load_modprobe(void)
450 avl_for_each_element(&modules, m, avl)
451 if (m->state == PROBE)
457 avl_for_each_element(&modules, m, avl) {
458 if ((m->state == PROBE) && (!deps_available(m, 0))) {
459 if (!insert_module(get_module_path(m->name), m->options)) {
468 if ((m->state == PROBE) || m->error)
477 static int print_insmod_usage(void)
479 LOG("Usage:\n\tinsmod filename [args]\n");
484 static int print_usage(char *arg)
486 LOG("Usage:\n\t%s module\n", arg);
491 static int main_insmod(int argc, char **argv)
493 char *name, *cur, *options;
497 return print_insmod_usage();
499 name = get_module_name(argv[1]);
501 LOG("cannot find module - %s\n", argv[1]);
505 if (scan_loaded_modules())
508 if (find_module(name)) {
509 LOG("module is already loaded - %s\n", name);
516 for (len = 0, i = 2; i < argc; i++)
517 len += strlen(argv[i]) + 1;
519 options = malloc(len);
522 for (i = 2; i < argc; i++) {
527 cur += sprintf(cur, "%s", argv[i]);
530 ret = insert_module(get_module_path(name), options);
534 LOG("failed to insert %s\n", get_module_path(name));
539 static int main_rmmod(int argc, char **argv)
546 return print_usage("rmmod");
548 if (scan_loaded_modules())
551 name = get_module_name(argv[1]);
552 m = find_module(name);
554 LOG("module is not loaded\n");
557 ret = syscall(__NR_delete_module, m->name, 0);
560 LOG("unloading the module failed\n");
567 static int main_lsmod(int argc, char **argv)
571 if (scan_loaded_modules())
574 avl_for_each_element(&modules, m, avl)
575 if (m->state == LOADED)
576 printf("%-20s%8d%3d %s\n",
577 m->name, m->size, m->usage,
578 (*m->depends == '-') ? ("") : (m->depends));
585 static int main_modinfo(int argc, char **argv)
591 return print_usage("modinfo");
593 if (scan_module_folder())
596 name = get_module_name(argv[1]);
597 m = find_module(name);
599 LOG("cannot find module - %s\n", argv[1]);
603 name = get_module_path(m->name);
605 LOG("cannot find path of module - %s\n", m->name);
614 static int main_modprobe(int argc, char **argv)
620 return print_usage("modprobe");
622 if (scan_loaded_modules())
625 if (scan_module_folder())
628 name = get_module_name(argv[1]);
629 m = find_module(name);
630 if (m && m->state == LOADED) {
631 LOG("%s is already loaded\n", name);
634 LOG("failed to find a module named %s\n", name);
640 fail = load_modprobe();
643 LOG("%d module%s could not be probed\n",
644 fail, (fail == 1) ? ("") : ("s"));
646 avl_for_each_element(&modules, m, avl)
647 if ((m->state == PROBE) || m->error)
648 LOG("- %s\n", m->name);
657 static int main_loader(int argc, char **argv)
659 int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
660 char *dir = "/etc/modules.d/*";
672 path = malloc(strlen(dir) + 2);
676 if (scan_loaded_modules())
679 if (scan_module_folder())
682 syslog(0, "kmodloader: loading kernel modules from %s\n", path);
684 if (glob(path, gl_flags, NULL, &gl) < 0)
687 for (j = 0; j < gl.gl_pathc; j++) {
688 FILE *fp = fopen(gl.gl_pathv[j], "r");
693 LOG("failed to open %s\n", gl.gl_pathv[j]);
697 while (getline(&mod, &mod_len, fp) > 0) {
698 char *nl = strchr(mod, '\n');
705 opts = strchr(mod, ' ');
709 m = find_module(get_module_name(mod));
710 if (!m || (m->state == LOADED))
715 if (basename(gl.gl_pathv[j])[0] - '0' <= 9)
723 fail = load_modprobe();
724 LOG("ran %d iterations\n", iterations);
727 LOG("%d module%s could not be probed\n",
728 fail, (fail == 1) ? ("") : ("s"));
730 avl_for_each_element(&modules, m, avl)
731 if ((m->state == PROBE) || (m->error))
732 LOG("- %s - %d\n", m->name, deps_available(m, 1));
742 static int avl_modcmp(const void *k1, const void *k2, void *ptr)
747 while (*s1 && ((*s1 == *s2) ||
748 ((*s1 == '_') && (*s2 == '-')) ||
749 ((*s1 == '-') && (*s2 == '_'))))
755 return *(const unsigned char *)s1 - *(const unsigned char *)s2;
758 int main(int argc, char **argv)
760 char *exec = basename(*argv);
762 avl_init(&modules, avl_modcmp, false, NULL);
763 if (!strcmp(exec, "insmod"))
764 return main_insmod(argc, argv);
766 if (!strcmp(exec, "rmmod"))
767 return main_rmmod(argc, argv);
769 if (!strcmp(exec, "lsmod"))
770 return main_lsmod(argc, argv);
772 if (!strcmp(exec, "modinfo"))
773 return main_modinfo(argc, argv);
775 if (!strcmp(exec, "modprobe"))
776 return main_modprobe(argc, argv);
778 return main_loader(argc, argv);