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__); \
65 static struct avl_tree modules
;
66 static char *prefix
= "";
68 static struct module
*find_module(const char *name
)
71 return avl_find_element(&modules
, name
, m
, avl
);
74 static void free_modules(void)
76 struct module
*m
, *tmp
;
78 avl_remove_all_elements(&modules
, m
, avl
, tmp
)
82 static char* get_module_path(char *name
)
84 static char path
[256];
93 snprintf(path
, 256, "%s" DEF_MOD_PATH
"%s.ko", prefix
, ver
.release
, name
);
105 snprintf(path
, 256, "%s" DEF_MOD_PATH
"%s.ko", prefix
, ver
.release
, name
);
113 static char* get_module_name(char *path
)
115 static char name
[32];
118 strncpy(name
, basename(path
), sizeof(name
));
120 t
= strstr(name
, ".ko");
134 static int elf_find_section(char *map
, const char *section
, unsigned int *offset
, unsigned int *size
)
136 const char *secnames
;
141 e
= (Elf64_Ehdr
*) map
;
142 sh
= (Elf64_Shdr
*) (map
+ e
->e_shoff
);
144 secnames
= map
+ sh
[e
->e_shstrndx
].sh_offset
;
145 for (i
= 0; i
< e
->e_shnum
; i
++) {
146 if (!strcmp(section
, secnames
+ sh
[i
].sh_name
)) {
147 *size
= sh
[i
].sh_size
;
148 *offset
= sh
[i
].sh_offset
;
156 static int elf_find_section(char *map
, const char *section
, unsigned int *offset
, unsigned int *size
)
158 const char *secnames
;
163 e
= (Elf32_Ehdr
*) map
;
164 sh
= (Elf32_Shdr
*) (map
+ e
->e_shoff
);
166 secnames
= map
+ sh
[e
->e_shstrndx
].sh_offset
;
167 for (i
= 0; i
< e
->e_shnum
; i
++) {
168 if (!strcmp(section
, secnames
+ sh
[i
].sh_name
)) {
169 *size
= sh
[i
].sh_size
;
170 *offset
= sh
[i
].sh_offset
;
179 static struct module
*
180 alloc_module(const char *name
, const char *depends
, int size
)
185 m
= calloc_a(sizeof(*m
),
186 &_name
, strlen(name
) + 1,
187 &_dep
, depends
? strlen(depends
) + 1 : 0);
191 m
->avl
.key
= m
->name
= strcpy(_name
, name
);
194 m
->depends
= strcpy(_dep
, depends
);
197 avl_insert(&modules
, &m
->avl
);
201 static int scan_loaded_modules(void)
207 fp
= fopen("/proc/modules", "r");
209 LOG("failed to open /proc/modules\n");
213 while (getline(&buf
, &buf_len
, fp
) > 0) {
217 m
.name
= strtok(buf
, " ");
218 m
.size
= atoi(strtok(NULL
, " "));
219 m
.usage
= atoi(strtok(NULL
, " "));
220 m
.depends
= strtok(NULL
, " ");
222 if (!m
.name
|| !m
.depends
)
225 n
= alloc_module(m
.name
, m
.depends
, m
.size
);
235 static struct module
* get_module_info(const char *module
, const char *name
)
237 int fd
= open(module
, O_RDONLY
);
238 unsigned int offset
, size
;
239 char *map
, *strings
, *dep
= NULL
;
244 LOG("failed to open %s\n", module
);
248 if (fstat(fd
, &s
) == -1) {
249 LOG("failed to stat %s\n", module
);
253 map
= mmap(NULL
, s
.st_size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
254 if (map
== MAP_FAILED
) {
255 LOG("failed to mmap %s\n", module
);
259 if (elf_find_section(map
, ".modinfo", &offset
, &size
)) {
260 LOG("failed to load the .modinfo section from %s\n", module
);
264 strings
= map
+ offset
;
265 while (strings
&& (strings
< map
+ offset
+ size
)) {
271 sep
= strstr(strings
, "=");
276 if (!strncmp(strings
, "depends=", len
+ 1))
278 strings
= &sep
[strlen(sep
)];
281 m
= alloc_module(name
, dep
, s
.st_size
);
290 static int scan_module_folder(void)
292 int gl_flags
= GLOB_NOESCAPE
| GLOB_MARK
;
299 path
= alloca(sizeof(DEF_MOD_PATH
"*.ko") + strlen(ver
.release
) + 1);
300 sprintf(path
, DEF_MOD_PATH
"*.ko", ver
.release
);
302 if (glob(path
, gl_flags
, NULL
, &gl
) < 0)
305 for (j
= 0; j
< gl
.gl_pathc
; j
++) {
306 char *name
= get_module_name(gl
.gl_pathv
[j
]);
312 m
= find_module(name
);
314 get_module_info(gl
.gl_pathv
[j
], name
);
323 static int print_modinfo(char *module
)
325 int fd
= open(module
, O_RDONLY
);
326 unsigned int offset
, size
;
331 LOG("failed to open %s\n", module
);
335 if (fstat(fd
, &s
) == -1) {
336 LOG("failed to stat %s\n", module
);
340 map
= mmap(NULL
, s
.st_size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
341 if (map
== MAP_FAILED
) {
342 LOG("failed to mmap %s\n", module
);
346 if (elf_find_section(map
, ".modinfo", &offset
, &size
)) {
347 LOG("failed to load the .modinfo section from %s\n", module
);
351 strings
= map
+ offset
;
352 printf("module:\t\t%s\n", module
);
353 while (strings
&& (strings
< map
+ offset
+ size
)) {
359 sep
= strstr(strings
, "=");
362 dup
= strndup(strings
, sep
- strings
);
364 if (strncmp(strings
, "parm", 4)) {
366 printf("%s:\t\t%s\n", dup
, sep
);
368 printf("%s:\t%s\n", dup
, sep
);
370 strings
= &sep
[strlen(sep
)];
378 static int deps_available(struct module
*m
, int verbose
)
384 if (!strcmp(m
->depends
, "-") || !strcmp(m
->depends
, ""))
387 _deps
= deps
= strdup(m
->depends
);
390 comma
= strstr(deps
, ",");
394 m
= find_module(deps
);
397 LOG("missing dependency %s\n", deps
);
398 if (verbose
&& m
&& (m
->state
!= LOADED
))
399 LOG("dependency not loaded %s\n", deps
);
400 if (!m
|| (m
->state
!= LOADED
))
411 static int insert_module(char *path
, const char *options
)
417 if (stat(path
, &s
)) {
418 LOG("missing module %s\n", path
);
422 fd
= open(path
, O_RDONLY
);
424 LOG("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
, s
.st_size
, options
);
432 LOG("failed to read full module %s\n", path
);
440 static void load_moddeps(struct module
*_m
)
446 if (!strcmp(_m
->depends
, "-") || !strcmp(_m
->depends
, ""))
449 _deps
= deps
= strdup(_m
->depends
);
454 comma
= strstr(deps
, ",");
458 m
= find_module(deps
);
466 m
= find_module(deps
);
470 LOG("failed to find dependency %s\n", deps
);
471 if (m
&& (m
->state
!= LOADED
)) {
483 static int load_modprobe(void)
488 avl_for_each_element(&modules
, m
, avl
)
489 if (m
->state
== PROBE
)
495 avl_for_each_element(&modules
, m
, avl
) {
496 if ((m
->state
== PROBE
) && (!deps_available(m
, 0))) {
497 if (!insert_module(get_module_path(m
->name
), "")) {
506 if ((m
->state
== PROBE
) || m
->error
)
514 static int print_insmod_usage(void)
516 LOG("Usage:\n\tinsmod filename [args]\n");
521 static int print_usage(char *arg
)
523 LOG("Usage:\n\t%s module\n", arg
);
528 static int main_insmod(int argc
, char **argv
)
530 char *name
, *cur
, *options
;
534 return print_insmod_usage();
536 name
= get_module_name(argv
[1]);
538 LOG("cannot find module - %s\n", argv
[1]);
542 if (scan_loaded_modules())
545 if (find_module(name
)) {
546 LOG("module is already loaded - %s\n", name
);
553 for (len
= 0, i
= 2; i
< argc
; i
++)
554 len
+= strlen(argv
[i
]) + 1;
556 options
= malloc(len
);
559 for (i
= 2; i
< argc
; i
++) {
564 cur
+= sprintf(cur
, "%s", argv
[i
]);
567 ret
= insert_module(get_module_path(name
), options
);
571 LOG("failed to insert %s\n", get_module_path(name
));
576 static int main_rmmod(int argc
, char **argv
)
583 return print_usage("rmmod");
585 if (scan_loaded_modules())
588 name
= get_module_name(argv
[1]);
589 m
= find_module(name
);
591 LOG("module is not loaded\n");
596 ret
= syscall(__NR_delete_module
, name
, 0);
599 LOG("unloading the module failed\n");
604 static int main_lsmod(int argc
, char **argv
)
608 if (scan_loaded_modules())
611 avl_for_each_element(&modules
, m
, avl
)
612 if (m
->state
== LOADED
)
613 printf("%-20s%8d%3d %s\n",
614 m
->name
, m
->size
, m
->usage
,
615 (*m
->depends
== '-') ? ("") : (m
->depends
));
622 static int main_modinfo(int argc
, char **argv
)
627 return print_usage("modinfo");
629 module
= get_module_path(argv
[1]);
631 LOG("cannot find module - %s\n", argv
[1]);
635 print_modinfo(module
);
640 static int main_modprobe(int argc
, char **argv
)
646 return print_usage("modprobe");
648 if (scan_loaded_modules())
651 if (scan_module_folder())
654 name
= get_module_name(argv
[1]);
655 m
= find_module(name
);
656 if (m
&& m
->state
== LOADED
) {
657 LOG("%s is already loaded\n", name
);
660 LOG("failed to find a module named %s\n", name
);
666 fail
= load_modprobe();
669 LOG("%d module%s could not be probed\n",
670 fail
, (fail
== 1) ? ("") : ("s"));
672 avl_for_each_element(&modules
, m
, avl
)
673 if ((m
->state
== PROBE
) || m
->error
)
674 LOG("- %s\n", m
->name
);
683 static int main_loader(int argc
, char **argv
)
685 int gl_flags
= GLOB_NOESCAPE
| GLOB_MARK
;
686 char *dir
= "/etc/modules.d/*";
698 path
= malloc(strlen(dir
) + 2);
702 if (scan_loaded_modules())
705 if (scan_module_folder())
708 syslog(0, "kmodloader: loading kernel modules from %s\n", path
);
710 if (glob(path
, gl_flags
, NULL
, &gl
) < 0)
713 for (j
= 0; j
< gl
.gl_pathc
; j
++) {
714 FILE *fp
= fopen(gl
.gl_pathv
[j
], "r");
719 LOG("failed to open %s\n", gl
.gl_pathv
[j
]);
723 while (getline(&mod
, &mod_len
, fp
) > 0) {
724 char *nl
= strchr(mod
, '\n');
731 opts
= strchr(mod
, ' ');
735 m
= find_module(get_module_name(mod
));
736 if (!m
|| (m
->state
== LOADED
))
740 if (basename(gl
.gl_pathv
[j
])[0] - '0' <= 9)
748 fail
= load_modprobe();
751 LOG("%d module%s could not be probed\n",
752 fail
, (fail
== 1) ? ("") : ("s"));
754 avl_for_each_element(&modules
, m
, avl
)
755 if ((m
->state
== PROBE
) || (m
->error
))
756 LOG("- %s - %d\n", m
->name
, deps_available(m
, 1));
766 int main(int argc
, char **argv
)
768 char *exec
= basename(*argv
);
770 avl_init(&modules
, avl_strcmp
, false, NULL
);
771 if (!strcmp(exec
, "insmod"))
772 return main_insmod(argc
, argv
);
774 if (!strcmp(exec
, "rmmod"))
775 return main_rmmod(argc
, argv
);
777 if (!strcmp(exec
, "lsmod"))
778 return main_lsmod(argc
, argv
);
780 if (!strcmp(exec
, "modinfo"))
781 return main_modinfo(argc
, argv
);
783 if (!strcmp(exec
, "modprobe"))
784 return main_modprobe(argc
, argv
);
786 return main_loader(argc
, argv
);