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/"
58 int refcnt
; /* number of references from module_node.m */
67 static struct avl_tree modules
;
69 static char **module_folders
= NULL
;
71 static void free_module(struct module
*m
);
73 static int init_module_folders(void)
78 char *s
, *e
, *p
, path
[256], ldpath
[256];
81 s
= getenv("LD_LIBRARY_PATH");
84 e
+= snprintf(ldpath
, sizeof(ldpath
), "%s:", s
);
86 e
+= snprintf(e
, sizeof(ldpath
) - (e
- ldpath
), "/lib");
90 for (s
= p
= ldpath
; p
<= e
; p
++) {
91 if (*p
!= ':' && *p
!= '\0')
95 snprintf(path
, sizeof(path
), "%s" DEF_MOD_PATH
, s
, ver
.release
);
97 if (!stat(path
, &st
) && S_ISDIR(st
.st_mode
)) {
98 module_folders
= realloc(module_folders
, sizeof(p
) * (n
+ 2));
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
[32];
163 strncpy(name
, basename(path
), sizeof(name
));
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
];
220 if (clazz
== ELFCLASS32
)
221 return elf32_find_section(map
, section
, offset
, size
);
222 else if (clazz
== ELFCLASS64
)
223 return elf64_find_section(map
, section
, offset
, size
);
225 ULOG_ERR("unknown elf format %d\n", clazz
);
230 static struct module_node
*
231 alloc_module_node(const char *name
, struct module
*m
, bool is_alias
)
233 struct module_node
*mn
;
236 mn
= calloc_a(sizeof(*mn
),
237 &_name
, strlen(name
) + 1);
239 mn
->avl
.key
= strcpy(_name
, name
);
241 mn
->is_alias
= is_alias
;
242 avl_insert(&modules
, &mn
->avl
);
248 static struct module
*
249 alloc_module(const char *name
, const char * const *aliases
, int naliases
, const char *depends
, int size
)
256 len_aliases
= naliases
* sizeof(aliases
[0]);
257 for (i
= 0; i
< naliases
; i
++)
258 len_aliases
+= strlen(aliases
[i
]) + 1;
259 m
= calloc_a(sizeof(*m
),
260 &_name
, strlen(name
) + 1,
261 &_dep
, depends
? strlen(depends
) + 2 : 0,
262 &_aliases
, len_aliases
);
266 m
->name
= strcpy(_name
, name
);
270 m
->depends
= strcpy(_dep
, depends
);
278 m
->naliases
= naliases
;
282 char *ptr
= (char *)_aliases
+ naliases
* sizeof(_aliases
[0]);
287 len
= strlen(aliases
[i
]) + 1;
288 memcpy(ptr
, aliases
[i
], len
);
292 } while (i
< naliases
);
293 m
->aliases
= _aliases
;
297 alloc_module_node(m
->name
, m
, false);
298 for (i
= 0; i
< m
->naliases
; i
++)
299 alloc_module_node(m
->aliases
[i
], m
, true);
304 static void free_module(struct module
*m
)
311 static int scan_loaded_modules(void)
317 fp
= fopen("/proc/modules", "r");
319 ULOG_ERR("failed to open /proc/modules\n");
323 while (getline(&buf
, &buf_len
, fp
) > 0) {
327 m
.name
= strtok(buf
, " ");
328 m
.size
= atoi(strtok(NULL
, " "));
329 m
.usage
= atoi(strtok(NULL
, " "));
330 m
.depends
= strtok(NULL
, " ");
332 if (!m
.name
|| !m
.depends
)
335 n
= find_module(m
.name
);
337 /* possibly a module outside /lib/modules/<ver>/ */
338 n
= alloc_module(m
.name
, NULL
, 0, m
.depends
, m
.size
);
349 static struct module
* get_module_info(const char *module
, const char *name
)
351 int fd
= open(module
, O_RDONLY
);
352 unsigned int offset
, size
;
353 char *map
= MAP_FAILED
, *strings
, *dep
= NULL
;
354 const char *aliases
[32];
356 struct module
*m
= NULL
;
360 ULOG_ERR("failed to open %s\n", module
);
364 if (fstat(fd
, &s
) == -1) {
365 ULOG_ERR("failed to stat %s\n", module
);
369 map
= mmap(NULL
, s
.st_size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
370 if (map
== MAP_FAILED
) {
371 ULOG_ERR("failed to mmap %s\n", module
);
375 if (elf_find_section(map
, ".modinfo", &offset
, &size
)) {
376 ULOG_ERR("failed to load the .modinfo section from %s\n", module
);
380 strings
= map
+ offset
;
387 if (strings
>= map
+ offset
+ size
)
389 sep
= strstr(strings
, "=");
394 if (!strncmp(strings
, "depends=", len
+ 1))
396 else if (!strncmp(strings
, "alias=", len
+ 1)) {
397 if (naliases
< ARRAY_SIZE(aliases
))
398 aliases
[naliases
++] = sep
;
400 ULOG_WARN("module %s has more than %d aliases: truncated",
401 name
, ARRAY_SIZE(aliases
));
403 strings
= &sep
[strlen(sep
)];
406 m
= alloc_module(name
, aliases
, naliases
, dep
, s
.st_size
);
412 if (map
!= MAP_FAILED
)
413 munmap(map
, s
.st_size
);
421 static int scan_module_folder(const char *dir
)
423 int gl_flags
= GLOB_NOESCAPE
| GLOB_MARK
;
430 path
= alloca(strlen(dir
) + sizeof("*.ko") + 1);
431 sprintf(path
, "%s*.ko", dir
);
433 if (glob(path
, gl_flags
, NULL
, &gl
) < 0)
436 for (j
= 0; j
< gl
.gl_pathc
; j
++) {
437 char *name
= get_module_name(gl
.gl_pathv
[j
]);
443 m
= find_module(name
);
445 get_module_info(gl
.gl_pathv
[j
], name
);
453 static int scan_module_folders(void)
458 if (init_module_folders())
461 for (p
= module_folders
; *p
; p
++)
462 rv
|= scan_module_folder(*p
);
467 static int print_modinfo(char *module
)
469 int fd
= open(module
, O_RDONLY
);
470 unsigned int offset
, size
;
472 char *map
= MAP_FAILED
, *strings
;
476 ULOG_ERR("failed to open %s\n", module
);
480 if (fstat(fd
, &s
) == -1) {
481 ULOG_ERR("failed to stat %s\n", module
);
485 map
= mmap(NULL
, s
.st_size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
486 if (map
== MAP_FAILED
) {
487 ULOG_ERR("failed to mmap %s\n", module
);
491 if (elf_find_section(map
, ".modinfo", &offset
, &size
)) {
492 ULOG_ERR("failed to load the .modinfo section from %s\n", module
);
496 strings
= map
+ offset
;
497 printf("module:\t\t%s\n", module
);
504 if (strings
>= map
+ offset
+ size
)
506 sep
= strstr(strings
, "=");
509 dup
= strndup(strings
, sep
- strings
);
511 if (strncmp(strings
, "parm", 4)) {
513 printf("%s:\t\t%s\n", dup
, sep
);
515 printf("%s:\t%s\n", dup
, sep
);
517 strings
= &sep
[strlen(sep
)];
525 if (map
!= MAP_FAILED
)
526 munmap(map
, s
.st_size
);
534 static int deps_available(struct module
*m
, int verbose
)
539 if (!m
->depends
|| !strcmp(m
->depends
, "-") || !strcmp(m
->depends
, ""))
545 m
= find_module(dep
);
548 ULOG_ERR("missing dependency %s\n", dep
);
549 if (verbose
&& m
&& (m
->state
!= LOADED
))
550 ULOG_ERR("dependency not loaded %s\n", dep
);
551 if (!m
|| (m
->state
!= LOADED
))
553 dep
+= strlen(dep
) + 1;
559 static int insert_module(char *path
, const char *options
)
565 if (stat(path
, &s
)) {
566 ULOG_ERR("missing module %s\n", path
);
570 fd
= open(path
, O_RDONLY
);
572 ULOG_ERR("cannot open %s\n", path
);
576 data
= malloc(s
.st_size
);
577 if (read(fd
, data
, s
.st_size
) == s
.st_size
) {
578 ret
= syscall(__NR_init_module
, data
, (unsigned long) s
.st_size
, options
);
583 ULOG_ERR("failed to read full module %s\n", path
);
591 static void load_moddeps(struct module
*_m
)
596 if (!strcmp(_m
->depends
, "-") || !strcmp(_m
->depends
, ""))
602 m
= find_module(dep
);
605 ULOG_ERR("failed to find dependency %s\n", dep
);
606 if (m
&& (m
->state
!= LOADED
)) {
611 dep
= dep
+ strlen(dep
) + 1;
615 static int iterations
= 0;
616 static int load_modprobe(void)
619 struct module_node
*mn
;
622 avl_for_each_element(&modules
, mn
, avl
) {
626 if (m
->state
== PROBE
)
633 avl_for_each_element(&modules
, mn
, avl
) {
637 if ((m
->state
== PROBE
) && (!deps_available(m
, 0))) {
638 if (!insert_module(get_module_path(m
->name
), (m
->opts
) ? (m
->opts
) : (""))) {
647 if ((m
->state
== PROBE
) || m
->error
)
656 static int print_insmod_usage(void)
658 ULOG_INFO("Usage:\n\tinsmod filename [args]\n");
663 static int print_usage(char *arg
)
665 ULOG_INFO("Usage:\n\t%s module\n", arg
);
670 static int main_insmod(int argc
, char **argv
)
672 char *name
, *cur
, *options
;
676 return print_insmod_usage();
678 name
= get_module_name(argv
[1]);
680 ULOG_ERR("cannot find module - %s\n", argv
[1]);
684 if (scan_loaded_modules())
687 if (find_module(name
)) {
688 ULOG_ERR("module is already loaded - %s\n", name
);
695 for (len
= 0, i
= 2; i
< argc
; i
++)
696 len
+= strlen(argv
[i
]) + 1;
698 options
= malloc(len
);
701 for (i
= 2; i
< argc
; i
++) {
706 cur
+= sprintf(cur
, "%s", argv
[i
]);
709 if (init_module_folders()) {
710 fprintf(stderr
, "Failed to find the folder holding the modules\n");
714 if (get_module_path(argv
[1])) {
716 } else if (!get_module_path(name
)) {
717 fprintf(stderr
, "Failed to find %s. Maybe it is a built in module ?\n", name
);
721 ret
= insert_module(get_module_path(name
), options
);
725 ULOG_ERR("failed to insert %s\n", get_module_path(name
));
730 static int main_rmmod(int argc
, char **argv
)
737 return print_usage("rmmod");
739 if (scan_loaded_modules())
742 name
= get_module_name(argv
[1]);
743 m
= find_module(name
);
745 ULOG_ERR("module is not loaded\n");
748 ret
= syscall(__NR_delete_module
, m
->name
, 0);
751 ULOG_ERR("unloading the module failed\n");
758 static int main_lsmod(int argc
, char **argv
)
760 struct module_node
*mn
;
764 if (scan_loaded_modules())
767 avl_for_each_element(&modules
, mn
, avl
) {
771 if (m
->state
== LOADED
) {
772 printf("%-20s%8d%3d ",
773 m
->name
, m
->size
, m
->usage
);
774 if (m
->depends
&& strcmp(m
->depends
, "-") && strcmp(m
->depends
, "")) {
778 dep
= dep
+ strlen(dep
) + 1;
792 static int main_modinfo(int argc
, char **argv
)
798 return print_usage("modinfo");
800 if (scan_module_folders())
803 name
= get_module_name(argv
[1]);
804 m
= find_module(name
);
806 ULOG_ERR("cannot find module - %s\n", argv
[1]);
810 name
= get_module_path(m
->name
);
812 ULOG_ERR("cannot find path of module - %s\n", m
->name
);
821 static int main_modprobe(int argc
, char **argv
)
823 struct module_node
*mn
;
829 for (i
= 1; i
< argc
; i
++)
830 if (argv
[i
][0] != '-') {
835 return print_usage("modprobe");
837 if (scan_module_folders())
840 if (scan_loaded_modules())
843 name
= get_module_name(mod
);
844 m
= find_module(name
);
845 if (m
&& m
->state
== LOADED
) {
846 ULOG_ERR("%s is already loaded\n", name
);
849 ULOG_ERR("failed to find a module named %s\n", name
);
855 fail
= load_modprobe();
858 ULOG_ERR("%d module%s could not be probed\n",
859 fail
, (fail
== 1) ? ("") : ("s"));
861 avl_for_each_element(&modules
, mn
, avl
) {
865 if ((m
->state
== PROBE
) || m
->error
)
866 ULOG_ERR("- %s\n", m
->name
);
876 static int main_loader(int argc
, char **argv
)
878 int gl_flags
= GLOB_NOESCAPE
| GLOB_MARK
;
879 char *dir
= "/etc/modules.d/";
880 struct module_node
*mn
;
889 path
= malloc(strlen(dir
) + 2);
893 if (scan_module_folders()) {
898 if (scan_loaded_modules()) {
903 ULOG_INFO("loading kernel modules from %s\n", path
);
905 if (glob(path
, gl_flags
, NULL
, &gl
) < 0)
908 for (j
= 0; j
< gl
.gl_pathc
; j
++) {
909 FILE *fp
= fopen(gl
.gl_pathv
[j
], "r");
914 ULOG_ERR("failed to open %s\n", gl
.gl_pathv
[j
]);
918 while (getline(&mod
, &mod_len
, fp
) > 0) {
919 char *nl
= strchr(mod
, '\n');
926 opts
= strchr(mod
, ' ');
930 m
= find_module(get_module_name(mod
));
931 if (!m
|| (m
->state
== LOADED
))
935 m
->opts
= strdup(opts
);
937 if (basename(gl
.gl_pathv
[j
])[0] - '0' <= 9)
945 fail
= load_modprobe();
948 ULOG_ERR("%d module%s could not be probed\n",
949 fail
, (fail
== 1) ? ("") : ("s"));
951 avl_for_each_element(&modules
, mn
, avl
) {
955 if ((m
->state
== PROBE
) || (m
->error
))
956 ULOG_ERR("- %s - %d\n", m
->name
, deps_available(m
, 1));
959 ULOG_INFO("done loading kernel modules from %s\n", path
);
969 static int avl_modcmp(const void *k1
, const void *k2
, void *ptr
)
974 while (*s1
&& ((*s1
== *s2
) ||
975 ((*s1
== '_') && (*s2
== '-')) ||
976 ((*s1
== '-') && (*s2
== '_'))))
982 return *(const unsigned char *)s1
- *(const unsigned char *)s2
;
985 int main(int argc
, char **argv
)
987 char *exec
= basename(*argv
);
989 avl_init(&modules
, avl_modcmp
, false, NULL
);
990 if (!strcmp(exec
, "insmod"))
991 return main_insmod(argc
, argv
);
993 if (!strcmp(exec
, "rmmod"))
994 return main_rmmod(argc
, argv
);
996 if (!strcmp(exec
, "lsmod"))
997 return main_lsmod(argc
, argv
);
999 if (!strcmp(exec
, "modinfo"))
1000 return main_modinfo(argc
, argv
);
1002 if (!strcmp(exec
, "modprobe"))
1003 return main_modprobe(argc
, argv
);
1005 ulog_open(ULOG_KMSG
, LOG_USER
, "kmodloader");
1006 return main_loader(argc
, argv
);