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));
101 module_folders
[n
++] = strdup(path
);
110 module_folders
[n
] = NULL
;
114 static struct module
*find_module(const char *name
)
116 struct module_node
*mn
;
117 mn
= avl_find_element(&modules
, name
, mn
, avl
);
124 static void free_modules(void)
126 struct module_node
*mn
, *tmp
;
128 avl_remove_all_elements(&modules
, mn
, avl
, tmp
) {
129 struct module
*m
= mn
->m
;
138 static char* get_module_path(char *name
)
141 static char path
[256];
144 if (!stat(name
, &s
) && S_ISREG(s
.st_mode
))
147 for (p
= module_folders
; *p
; p
++) {
148 snprintf(path
, sizeof(path
), "%s%s.ko", *p
, name
);
149 if (!stat(path
, &s
) && S_ISREG(s
.st_mode
))
156 static char* get_module_name(char *path
)
158 static char name
[33];
161 strncpy(name
, basename(path
), sizeof(name
) - 1);
163 t
= strstr(name
, ".ko");
170 static int elf64_find_section(char *map
, const char *section
, unsigned int *offset
, unsigned int *size
)
172 const char *secnames
;
177 e
= (Elf64_Ehdr
*) map
;
178 sh
= (Elf64_Shdr
*) (map
+ e
->e_shoff
);
180 secnames
= map
+ sh
[e
->e_shstrndx
].sh_offset
;
181 for (i
= 0; i
< e
->e_shnum
; i
++) {
182 if (!strcmp(section
, secnames
+ sh
[i
].sh_name
)) {
183 *size
= sh
[i
].sh_size
;
184 *offset
= sh
[i
].sh_offset
;
192 static int elf32_find_section(char *map
, const char *section
, unsigned int *offset
, unsigned int *size
)
194 const char *secnames
;
199 e
= (Elf32_Ehdr
*) map
;
200 sh
= (Elf32_Shdr
*) (map
+ e
->e_shoff
);
202 secnames
= map
+ sh
[e
->e_shstrndx
].sh_offset
;
203 for (i
= 0; i
< e
->e_shnum
; i
++) {
204 if (!strcmp(section
, secnames
+ sh
[i
].sh_name
)) {
205 *size
= sh
[i
].sh_size
;
206 *offset
= sh
[i
].sh_offset
;
214 static int elf_find_section(char *map
, const char *section
, unsigned int *offset
, unsigned int *size
)
216 int clazz
= map
[EI_CLASS
];
217 int endian
= map
[EI_DATA
];
219 #if __BYTE_ORDER == __LITTLE_ENDIAN
220 if (endian
!= ELFDATA2LSB
)
221 #elif __BYTE_ORDER == __BIG_ENDIAN
222 if (endian
!= ELFDATA2MSB
)
224 #error "unsupported endian"
227 ULOG_ERR("invalid endianess: %d\n", endian
);
231 if (clazz
== ELFCLASS32
)
232 return elf32_find_section(map
, section
, offset
, size
);
233 else if (clazz
== ELFCLASS64
)
234 return elf64_find_section(map
, section
, offset
, size
);
236 ULOG_ERR("unknown elf format %d\n", clazz
);
241 static struct module_node
*
242 alloc_module_node(const char *name
, struct module
*m
, bool is_alias
)
244 struct module_node
*mn
;
247 mn
= calloc_a(sizeof(*mn
),
248 &_name
, strlen(name
) + 1);
250 mn
->avl
.key
= strcpy(_name
, name
);
252 mn
->is_alias
= is_alias
;
253 avl_insert(&modules
, &mn
->avl
);
259 static struct module
*
260 alloc_module(const char *name
, const char * const *aliases
, int naliases
, const char *depends
, int size
)
266 m
= calloc_a(sizeof(*m
),
267 &_name
, strlen(name
) + 1,
268 &_dep
, depends
? strlen(depends
) + 2 : 0);
272 m
->name
= strcpy(_name
, name
);
276 m
->depends
= strcpy(_dep
, depends
);
286 alloc_module_node(m
->name
, m
, false);
287 for (i
= 0; i
< naliases
; i
++)
288 alloc_module_node(aliases
[i
], m
, true);
293 static void free_module(struct module
*m
)
300 static int scan_loaded_modules(void)
306 fp
= fopen("/proc/modules", "r");
308 ULOG_ERR("failed to open /proc/modules\n");
312 while (getline(&buf
, &buf_len
, fp
) > 0) {
316 m
.name
= strtok(buf
, " ");
317 m
.size
= atoi(strtok(NULL
, " "));
318 m
.usage
= atoi(strtok(NULL
, " "));
319 m
.depends
= strtok(NULL
, " ");
321 if (!m
.name
|| !m
.depends
)
324 n
= find_module(m
.name
);
326 /* possibly a module outside /lib/modules/<ver>/ */
327 n
= alloc_module(m
.name
, NULL
, 0, m
.depends
, m
.size
);
338 static struct module
* get_module_info(const char *module
, const char *name
)
340 int fd
= open(module
, O_RDONLY
);
341 unsigned int offset
, size
;
342 char *map
= MAP_FAILED
, *strings
, *dep
= NULL
;
343 const char **aliases
= NULL
;
345 struct module
*m
= NULL
;
349 ULOG_ERR("failed to open %s\n", module
);
353 if (fstat(fd
, &s
) == -1) {
354 ULOG_ERR("failed to stat %s\n", module
);
358 map
= mmap(NULL
, s
.st_size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
359 if (map
== MAP_FAILED
) {
360 ULOG_ERR("failed to mmap %s\n", module
);
364 if (elf_find_section(map
, ".modinfo", &offset
, &size
)) {
365 ULOG_ERR("failed to load the .modinfo section from %s\n", module
);
369 strings
= map
+ offset
;
376 if (strings
>= map
+ offset
+ size
)
378 sep
= strstr(strings
, "=");
383 if (!strncmp(strings
, "depends=", len
+ 1))
385 else if (!strncmp(strings
, "alias=", len
+ 1)) {
386 aliases
= realloc(aliases
, sizeof(sep
) * (naliases
+ 1));
388 ULOG_ERR("out of memory\n");
392 aliases
[naliases
++] = sep
;
394 strings
= &sep
[strlen(sep
)];
397 m
= alloc_module(name
, aliases
, naliases
, dep
, s
.st_size
);
403 if (map
!= MAP_FAILED
)
404 munmap(map
, s
.st_size
);
414 static int scan_module_folder(const char *dir
)
416 int gl_flags
= GLOB_NOESCAPE
| GLOB_MARK
;
423 path
= alloca(strlen(dir
) + sizeof("*.ko") + 1);
424 sprintf(path
, "%s*.ko", dir
);
426 if (glob(path
, gl_flags
, NULL
, &gl
) < 0)
429 for (j
= 0; j
< gl
.gl_pathc
; j
++) {
430 char *name
= get_module_name(gl
.gl_pathv
[j
]);
436 m
= find_module(name
);
438 if (!get_module_info(gl
.gl_pathv
[j
], name
))
448 static int scan_module_folders(void)
453 if (init_module_folders())
456 for (p
= module_folders
; *p
; p
++)
457 rv
|= scan_module_folder(*p
);
462 static int print_modinfo(char *module
)
464 int fd
= open(module
, O_RDONLY
);
465 unsigned int offset
, size
;
467 char *map
= MAP_FAILED
, *strings
;
471 ULOG_ERR("failed to open %s\n", module
);
475 if (fstat(fd
, &s
) == -1) {
476 ULOG_ERR("failed to stat %s\n", module
);
480 map
= mmap(NULL
, s
.st_size
, PROT_READ
, MAP_PRIVATE
, fd
, 0);
481 if (map
== MAP_FAILED
) {
482 ULOG_ERR("failed to mmap %s\n", module
);
486 if (elf_find_section(map
, ".modinfo", &offset
, &size
)) {
487 ULOG_ERR("failed to load the .modinfo section from %s\n", module
);
491 strings
= map
+ offset
;
492 printf("module:\t\t%s\n", module
);
499 if (strings
>= map
+ offset
+ size
)
501 sep
= strstr(strings
, "=");
504 dup
= strndup(strings
, sep
- strings
);
506 if (strncmp(strings
, "parm", 4)) {
508 printf("%s:\t\t%s\n", dup
, sep
);
510 printf("%s:\t%s\n", dup
, sep
);
512 strings
= &sep
[strlen(sep
)];
520 if (map
!= MAP_FAILED
)
521 munmap(map
, s
.st_size
);
529 static int deps_available(struct module
*m
, int verbose
)
534 if (!m
->depends
|| !strcmp(m
->depends
, "-") || !strcmp(m
->depends
, ""))
540 m
= find_module(dep
);
543 ULOG_ERR("missing dependency %s\n", dep
);
544 if (verbose
&& m
&& (m
->state
!= LOADED
))
545 ULOG_ERR("dependency not loaded %s\n", dep
);
546 if (!m
|| (m
->state
!= LOADED
))
548 dep
+= strlen(dep
) + 1;
554 static int insert_module(char *path
, const char *options
)
560 if (stat(path
, &s
)) {
561 ULOG_ERR("missing module %s\n", path
);
565 fd
= open(path
, O_RDONLY
);
567 ULOG_ERR("cannot open %s\n", path
);
571 data
= malloc(s
.st_size
);
575 if (read(fd
, data
, s
.st_size
) == s
.st_size
) {
576 ret
= syscall(__NR_init_module
, data
, (unsigned long) s
.st_size
, options
);
581 ULOG_ERR("failed to read full module %s\n", path
);
590 static void load_moddeps(struct module
*_m
)
595 if (!strcmp(_m
->depends
, "-") || !strcmp(_m
->depends
, ""))
601 m
= find_module(dep
);
604 ULOG_ERR("failed to find dependency %s\n", dep
);
605 if (m
&& (m
->state
!= LOADED
)) {
610 dep
= dep
+ strlen(dep
) + 1;
614 static int iterations
= 0;
615 static int load_modprobe(void)
618 struct module_node
*mn
;
621 avl_for_each_element(&modules
, mn
, avl
) {
625 if (m
->state
== PROBE
)
632 avl_for_each_element(&modules
, mn
, avl
) {
636 if ((m
->state
== PROBE
) && (!deps_available(m
, 0))) {
637 if (!insert_module(get_module_path(m
->name
), (m
->opts
) ? (m
->opts
) : (""))) {
646 if ((m
->state
== PROBE
) || m
->error
)
655 static int print_insmod_usage(void)
657 ULOG_INFO("Usage:\n\tinsmod filename [args]\n");
662 static int print_modprobe_usage(void)
664 ULOG_INFO("Usage:\n\tmodprobe [-q] filename\n");
669 static int print_usage(char *arg
)
671 ULOG_INFO("Usage:\n\t%s module\n", arg
);
676 static int main_insmod(int argc
, char **argv
)
678 char *name
, *cur
, *options
;
682 return print_insmod_usage();
684 name
= get_module_name(argv
[1]);
686 ULOG_ERR("cannot find module - %s\n", argv
[1]);
690 if (scan_loaded_modules())
693 if (find_module(name
)) {
694 ULOG_ERR("module is already loaded - %s\n", name
);
701 for (len
= 0, i
= 2; i
< argc
; i
++)
702 len
+= strlen(argv
[i
]) + 1;
704 options
= malloc(len
);
712 for (i
= 2; i
< argc
; i
++) {
717 cur
+= sprintf(cur
, "%s", argv
[i
]);
720 if (init_module_folders()) {
721 fprintf(stderr
, "Failed to find the folder holding the modules\n");
726 if (get_module_path(argv
[1])) {
728 } else if (!get_module_path(name
)) {
729 fprintf(stderr
, "Failed to find %s. Maybe it is a built in module ?\n", name
);
734 ret
= insert_module(get_module_path(name
), options
);
736 ULOG_ERR("failed to insert %s\n", get_module_path(name
));
743 static int main_rmmod(int argc
, char **argv
)
750 return print_usage("rmmod");
752 if (scan_loaded_modules())
755 name
= get_module_name(argv
[1]);
756 m
= find_module(name
);
758 ULOG_ERR("module is not loaded\n");
761 ret
= syscall(__NR_delete_module
, m
->name
, 0);
764 ULOG_ERR("unloading the module failed\n");
771 static int main_lsmod(int argc
, char **argv
)
773 struct module_node
*mn
;
777 if (scan_loaded_modules())
780 avl_for_each_element(&modules
, mn
, avl
) {
784 if (m
->state
== LOADED
) {
785 printf("%-20s%8d%3d ",
786 m
->name
, m
->size
, m
->usage
);
787 if (m
->depends
&& strcmp(m
->depends
, "-") && strcmp(m
->depends
, "")) {
791 dep
= dep
+ strlen(dep
) + 1;
805 static int main_modinfo(int argc
, char **argv
)
811 return print_usage("modinfo");
813 if (scan_module_folders())
816 name
= get_module_name(argv
[1]);
817 m
= find_module(name
);
819 ULOG_ERR("cannot find module - %s\n", argv
[1]);
823 name
= get_module_path(m
->name
);
825 ULOG_ERR("cannot find path of module - %s\n", m
->name
);
834 static int main_modprobe(int argc
, char **argv
)
836 struct module_node
*mn
;
843 while ((opt
= getopt(argc
, argv
, "q")) != -1 ) {
845 case 'q': /* shhhh! */
849 return print_modprobe_usage();
855 return print_modprobe_usage(); /* expected module after options */
859 if (scan_module_folders())
862 if (scan_loaded_modules())
865 name
= get_module_name(mod
);
866 m
= find_module(name
);
867 if (m
&& m
->state
== LOADED
) {
869 ULOG_ERR("%s is already loaded\n", name
);
873 ULOG_ERR("failed to find a module named %s\n", name
);
880 fail
= load_modprobe();
883 ULOG_ERR("%d module%s could not be probed\n",
884 fail
, (fail
== 1) ? ("") : ("s"));
886 avl_for_each_element(&modules
, mn
, avl
) {
890 if ((m
->state
== PROBE
) || m
->error
)
891 ULOG_ERR("- %s\n", m
->name
);
901 static int main_loader(int argc
, char **argv
)
903 int gl_flags
= GLOB_NOESCAPE
| GLOB_MARK
;
904 char *dir
= "/etc/modules.d/";
905 struct module_node
*mn
;
914 path
= malloc(strlen(dir
) + 2);
921 if (scan_module_folders()) {
926 if (scan_loaded_modules()) {
931 ULOG_INFO("loading kernel modules from %s\n", path
);
933 if (glob(path
, gl_flags
, NULL
, &gl
) < 0)
936 for (j
= 0; j
< gl
.gl_pathc
; j
++) {
937 FILE *fp
= fopen(gl
.gl_pathv
[j
], "r");
942 ULOG_ERR("failed to open %s\n", gl
.gl_pathv
[j
]);
946 while (getline(&mod
, &mod_len
, fp
) > 0) {
947 char *nl
= strchr(mod
, '\n');
954 opts
= strchr(mod
, ' ');
958 m
= find_module(get_module_name(mod
));
959 if (!m
|| (m
->state
== LOADED
))
963 m
->opts
= strdup(opts
);
965 if (basename(gl
.gl_pathv
[j
])[0] - '0' <= 9)
973 fail
= load_modprobe();
976 ULOG_ERR("%d module%s could not be probed\n",
977 fail
, (fail
== 1) ? ("") : ("s"));
979 avl_for_each_element(&modules
, mn
, avl
) {
983 if ((m
->state
== PROBE
) || (m
->error
))
984 ULOG_ERR("- %s - %d\n", m
->name
, deps_available(m
, 1));
987 ULOG_INFO("done loading kernel modules from %s\n", path
);
997 static inline char weight(char c
)
999 return c
== '_' ? '-' : c
;
1002 static int avl_modcmp(const void *k1
, const void *k2
, void *ptr
)
1004 const char *s1
= k1
;
1005 const char *s2
= k2
;
1007 while (*s1
&& (weight(*s1
) == weight(*s2
)))
1013 return (unsigned char)weight(*s1
) - (unsigned char)weight(*s2
);
1016 int main(int argc
, char **argv
)
1018 char *exec
= basename(*argv
);
1020 avl_init(&modules
, avl_modcmp
, false, NULL
);
1021 if (!strcmp(exec
, "insmod"))
1022 return main_insmod(argc
, argv
);
1024 if (!strcmp(exec
, "rmmod"))
1025 return main_rmmod(argc
, argv
);
1027 if (!strcmp(exec
, "lsmod"))
1028 return main_lsmod(argc
, argv
);
1030 if (!strcmp(exec
, "modinfo"))
1031 return main_modinfo(argc
, argv
);
1033 if (!strcmp(exec
, "modprobe"))
1034 return main_modprobe(argc
, argv
);
1036 ulog_open(ULOG_KMSG
, LOG_USER
, "kmodloader");
1037 return main_loader(argc
, argv
);