X-Git-Url: http://git.archive.openwrt.org/?p=project%2Fubox.git;a=blobdiff_plain;f=kmodloader.c;h=d72a1f452287e09a886792548eba24727e4e6778;hp=62b2d5bcaa4cd32b4f3ac032e597471e3c2a27ec;hb=1b19fc217e33e9b2fc2fab6f9552da740d03a98a;hpb=fa4c1e81dae3ffb7711be38c64eacf8ac3856e42

diff --git a/kmodloader.c b/kmodloader.c
index 62b2d5b..d72a1f4 100644
--- a/kmodloader.c
+++ b/kmodloader.c
@@ -14,6 +14,9 @@
 
 #define _GNU_SOURCE
 #include <sys/syscall.h>
+#include <sys/mman.h>
+#include <sys/utsname.h>
+
 #include <stdlib.h>
 #include <unistd.h>
 #include <sys/syscall.h>
@@ -26,19 +29,343 @@
 #include <fcntl.h>
 #include <syslog.h>
 #include <glob.h>
-#include <sys/utsname.h>
+#include <elf.h>
+
+#include <libubox/list.h>
+
+#define DEF_MOD_PATH "/lib/modules/%s/"
+
+enum {
+	SCANNED,
+	PROBE,
+	LOADED,
+	FAILED,
+};
+
+struct module {
+	struct list_head list;
+
+	char *name;
+	char *depends;
 
-#define DEF_MOD_PATH "/lib/modules/%s/%s.ko"
-static int insmod(char *module, const char *options)
+	int size;
+	int usage;
+	int state;
+};
+
+static LIST_HEAD(modules);
+
+static struct module* find_module(char *name)
 {
+	struct module *m = NULL;
+
+	list_for_each_entry(m, &modules, list)
+		if (!strcmp(m->name, name))
+			return m;
+	return NULL;
+}
+
+static void free_module(struct module *m)
+{
+	if (m->name)
+		free(m->name);
+	if (m->depends)
+		free(m->depends);
+	free(m);
+}
+
+static void free_modules(void)
+{
+	struct list_head *p, *n;
+
+	list_for_each_safe(p, n, &modules) {
+		struct module *m = container_of(p, struct module, list);
+		list_del(p);
+		free_module(m);
+	}
+}
+
+static char* get_module_path(char *name)
+{
+	static char path[256];
 	struct utsname ver;
-	char path[256];
-	void *data = 0;
 	struct stat s;
-	int fd, ret = -1;
+	char *t;
+
+	if (!stat(name, &s))
+		return name;
 
 	uname(&ver);
-	snprintf(path, 256, DEF_MOD_PATH, ver.release, module);
+	snprintf(path, 256, DEF_MOD_PATH "%s.ko", ver.release, name);
+
+	if (!stat(path, &s))
+		return path;
+
+	t = name;
+	while (t && *t) {
+		if (*t == '_')
+			*t = '-';
+		t++;
+	}
+
+	snprintf(path, 256, DEF_MOD_PATH "%s.ko", ver.release, name);
+
+	if (!stat(path, &s))
+		return path;
+
+	return NULL;
+}
+
+static char* get_module_name(char *path)
+{
+	static char name[32];
+	char *t;
+
+	strncpy(name, basename(path), sizeof(name));
+
+	t = strstr(name, ".ko");
+	if (t)
+		*t = '\0';
+	t = name;
+	while (t && *t) {
+		if (*t == '-')
+			*t = '_';
+		t++;
+	}
+
+	return name;
+}
+
+#if __WORDSIZE == 64
+static int elf_find_section(char *map, const char *section, unsigned int *offset, unsigned int *size)
+{
+	const char *secnames;
+	Elf64_Ehdr *e;
+	Elf64_Shdr *sh;
+	int i;
+
+	e = (Elf64_Ehdr *) map;
+	sh = (Elf64_Shdr *) (map + e->e_shoff);
+
+	secnames = map + sh[e->e_shstrndx].sh_offset;
+	for (i = 0; i < e->e_shnum; i++) {
+		if (!strcmp(section, secnames + sh[i].sh_name)) {
+			*size = sh[i].sh_size;
+			*offset = sh[i].sh_offset;
+			return 0;
+		}
+	}
+
+	return -1;
+}
+#else
+static int elf_find_section(char *map, const char *section, unsigned int *offset, unsigned int *size)
+{
+	const char *secnames;
+	Elf32_Ehdr *e;
+	Elf32_Shdr *sh;
+	int i;
+
+	e = (Elf32_Ehdr *) map;
+	sh = (Elf32_Shdr *) (map + e->e_shoff);
+
+	secnames = map + sh[e->e_shstrndx].sh_offset;
+	for (i = 0; i < e->e_shnum; i++) {
+		if (!strcmp(section, secnames + sh[i].sh_name)) {
+			*size = sh[i].sh_size;
+			*offset = sh[i].sh_offset;
+			return 0;
+		}
+	}
+
+	return -1;
+}
+#endif
+
+static int scan_loaded_modules(void)
+{
+	FILE *fp = fopen("/proc/modules", "r");
+	char buf[256];
+
+	if (!fp) {
+		fprintf(stderr, "failed to open /proc/modules\n");
+		return -1;
+	}
+
+	while (fgets(buf, sizeof(buf), fp)) {
+		struct module m;
+		struct module *n;
+
+		m.name = strtok(buf, " ");
+		m.size = atoi(strtok(NULL, " "));
+		m.usage = atoi(strtok(NULL, " "));
+		m.depends = strtok(NULL, " ");
+
+		if (!m.name || !m.depends)
+			continue;
+
+		n = malloc(sizeof(struct module));
+		if (!n)
+			continue;
+
+		n->name = strdup(m.name);
+		n->depends = strdup(m.depends);
+		n->size = m.size;
+		n->usage = m.usage;
+		n->state = LOADED;
+
+		list_add_tail(&n->list, &modules);
+	}
+
+	return 0;
+}
+
+static struct module* get_module_info(char *module)
+{
+	int fd = open(module, O_RDONLY);
+	unsigned int offset, size;
+	char *map, *strings;
+	struct module *m;
+	struct stat s;
+
+	if (!fd) {
+		fprintf(stderr, "failed to open %s\n", module);
+		return NULL;
+	}
+
+	if (fstat(fd, &s) == -1) {
+		fprintf(stderr, "failed to stat %s\n", module);
+		return NULL;
+	}
+
+	map = mmap(NULL, s.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
+	if (map == MAP_FAILED) {
+		fprintf(stderr, "failed to mmap %s\n", module);
+		return NULL;
+	}
+
+	if (elf_find_section(map, ".modinfo", &offset, &size)) {
+		fprintf(stderr, "failed to load the .modinfo section from %s\n", module);
+		return NULL;
+	}
+
+	strings = map + offset;
+	m = malloc(sizeof(struct module));
+	if (!m)
+		return NULL;
+
+	memset(m, 0, sizeof(struct module));
+	m->size = s.st_size;
+	while (strings && (strings < map + offset + size)) {
+		char *sep;
+		int len;
+
+		while (!strings[0])
+			strings++;
+		sep = strstr(strings, "=");
+		if (!sep)
+			break;
+		len = sep - strings;
+		sep++;
+		if (!strncmp(strings, "depends=", len + 1))
+			m->depends = strdup(sep);
+		strings = &sep[strlen(sep)];
+	}
+
+	m->state = SCANNED;
+
+	return m;
+}
+
+static int scan_module_folder(char *dir)
+{
+	int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
+	int j;
+	glob_t gl;
+
+	if (glob(dir, gl_flags, NULL, &gl) < 0)
+		return -1;
+
+	for (j = 0; j < gl.gl_pathc; j++) {
+		char *name = get_module_name(gl.gl_pathv[j]);
+		struct module *m;
+
+		if (!name)
+			continue;
+
+		m = find_module(name);
+		if (!m) {
+			m = get_module_info(gl.gl_pathv[j]);
+			m->name = strdup(name);
+			list_add_tail(&m->list, &modules);
+		}
+	}
+
+	globfree(&gl);
+
+	return 0;
+}
+
+static int print_modinfo(char *module)
+{
+	int fd = open(module, O_RDONLY);
+	unsigned int offset, size;
+	struct stat s;
+	char *map, *strings;
+
+	if (!fd) {
+		fprintf(stderr, "failed to open %s\n", module);
+		return -1;
+	}
+
+	if (fstat(fd, &s) == -1) {
+		fprintf(stderr, "failed to stat %s\n", module);
+		return -1;
+	}
+
+	map = mmap(NULL, s.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
+	if (map == MAP_FAILED) {
+		fprintf(stderr, "failed to mmap %s\n", module);
+		return -1;
+	}
+
+	if (elf_find_section(map, ".modinfo", &offset, &size)) {
+		fprintf(stderr, "failed to load the .modinfo section from %s\n", module);
+		return -1;
+	}
+
+	strings = map + offset;
+	printf("module:\t\t%s\n", module);
+	while (strings && (strings < map + offset + size)) {
+		char *dup = NULL;
+		char *sep;
+
+		while (!strings[0])
+			strings++;
+		sep = strstr(strings, "=");
+		if (!sep)
+			break;
+		dup = strndup(strings, sep - strings);
+		sep++;
+		if (strncmp(strings, "parm", 4)) {
+			if (strlen(dup) < 7)
+				printf("%s:\t\t%s\n",  dup, sep);
+			else
+				printf("%s:\t%s\n",  dup, sep);
+		}
+		strings = &sep[strlen(sep)];
+		if (dup)
+			free(dup);
+	}
+
+	return 0;
+}
+
+static int insert_module(char *path, const char *options)
+{
+	void *data = 0;
+	struct stat s;
+	int fd, ret = -1;
 
 	if (stat(path, &s)) {
 		fprintf(stderr, "missing module %s\n", path);
@@ -55,7 +382,7 @@ static int insmod(char *module, const char *options)
 	if (read(fd, data, s.st_size) == s.st_size) {
 		ret = syscall(__NR_init_module, data, s.st_size, options);
 		if (ret)
-			fprintf(stderr, "failed insert %s\n", module);
+			fprintf(stderr, "failed to insert %s\n", path);
 	} else {
 		fprintf(stderr, "failed to read full module %s\n", path);
 	}
@@ -66,24 +393,220 @@ static int insmod(char *module, const char *options)
 	return ret;
 }
 
-/*static void rmmod(char *module)
+static int deps_available(struct module *m)
 {
-	syscall(__NR_delete_module, module, 0);
-}*/
+	char *deps = m->depends;
+	char *comma;
 
-int main(int argc, char **argv)
+	if (!strcmp(deps, "-"))
+		return 0;
+	while (*deps && (NULL != ((comma = strstr(deps, ","))))) {
+		*comma = '\0';
+
+		m = find_module(deps);
+
+		if (!m || (m->state != LOADED))
+			return -1;
+
+		deps = ++comma;
+	}
+
+	return 0;
+}
+
+static int load_depmod(void)
+{
+	int loaded, todo;
+	struct module *m;
+
+	do {
+		loaded = 0;
+		todo = 0;
+		list_for_each_entry(m, &modules, list) {
+			if ((m->state == PROBE) && (!deps_available(m))) {
+				if (!insert_module(get_module_path(m->name), "")) {
+					m->state = LOADED;
+					loaded++;
+					continue;
+				}
+				m->state = FAILED;
+			} else if (m->state == PROBE) {
+				todo++;
+			}
+		}
+//		printf("loaded %d modules this pass\n", loaded);
+	} while (loaded);
+
+//	printf("missing todos %d\n", todo);
+
+	return -todo;
+}
+
+static int print_insmod_usage(void)
+{
+	fprintf(stderr, "Usage:\n\tinsmod filename [args]\n");
+
+	return -1;
+}
+
+static int print_usage(char *arg)
+{
+	fprintf(stderr, "Usage:\n\t%s module\n", arg);
+
+	return -1;
+}
+
+static int main_insmod(int argc, char **argv)
+{
+	char options[256] = "";
+	char *name;
+	int i;
+
+	if (argc < 2)
+		return print_insmod_usage();
+
+	name = get_module_name(argv[1]);
+	if (!name) {
+		fprintf(stderr, "cannot find module - %s\n", argv[1]);
+		return -1;
+	}
+
+	if (scan_loaded_modules())
+		return -1;
+
+	if (find_module(name)) {
+		fprintf(stderr, "module is already loaded - %s\n", name);
+		return -1;
+
+	}
+
+	free_modules();
+
+	for (i = 2; i < argc; i++)
+		if (snprintf(options, sizeof(options), "%s %s", options, argv[i]) >= sizeof(options)) {
+			fprintf(stderr, "argument line too long - %s\n", options);
+			return -1;
+		}
+
+	return insert_module(get_module_path(name), options);
+}
+
+static int main_rmmod(int argc, char **argv)
+{
+	struct module *m;
+	char *name;
+	int ret;
+
+	if (argc != 2)
+		return print_usage("rmmod");
+
+	if (scan_loaded_modules())
+		return -1;
+
+	name = get_module_name(argv[1]);
+	m = find_module(name);
+	if (!m) {
+		fprintf(stderr, "module is not loaded\n");
+		return -1;
+	}
+	free_modules();
+
+	ret = syscall(__NR_delete_module, name, 0);
+
+	if (ret)
+		fprintf(stderr, "unloading the module failed\n");
+
+	return ret;
+}
+
+static int main_lsmod(int argc, char **argv)
+{
+	struct module *m;
+
+	if (scan_loaded_modules())
+		return -1;
+
+	list_for_each_entry(m, &modules, list)
+		if (m->state == LOADED)
+			printf("%-20s%8d%3d %s\n",
+				m->name, m->size, m->usage,
+				(*m->depends == '-') ? ("") : (m->depends));
+
+	free_modules();
+
+	return 0;
+}
+
+static int main_modinfo(int argc, char **argv)
+{
+	char *module;
+
+	if (argc != 2)
+		return print_usage("modinfo");
+
+	module = get_module_path(argv[1]);
+	if (!module) {
+		fprintf(stderr, "cannot find module - %s\n", argv[1]);
+		return -1;
+	}
+
+	print_modinfo(module);
+
+	return 0;
+}
+
+static int main_depmod(int argc, char **argv)
+{
+	struct utsname ver;
+	struct module *m;
+	char path[128];
+	char *name;
+
+	if (argc != 2)
+		return print_usage("depmod");
+
+	if (scan_loaded_modules())
+		return -1;
+
+	uname(&ver);
+	snprintf(path, sizeof(path), DEF_MOD_PATH "*.ko", ver.release);
+
+	scan_module_folder(path);
+
+	name = get_module_name(argv[1]);
+	m = find_module(name);
+	if (m && m->state == LOADED) {
+		fprintf(stderr, "%s is already loaded\n", name);
+		return -1;
+	} else if (!m) {
+		fprintf(stderr, "failed to find a module named %s\n", name);
+	} else {
+		m->state = PROBE;
+		load_depmod();
+	}
+
+	free_modules();
+
+	return 0;
+}
+
+static int main_loader(int argc, char **argv)
 {
-	glob_t gl;
 	int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
-	char *tmp = malloc(256);
 	char *dir = "/etc/modules.d/*";
+	glob_t gl;
+	char *path;
 
 	if (argc > 1)
 		dir = argv[1];
 
-	syslog(0, "kmodloader: loading kernel modules from %s\n", dir);
+	path = malloc(strlen(dir) + 2);
+	strcpy(path, dir);
+	strcat(path, "*");
 
-	if (glob(dir, gl_flags, NULL, &gl) >= 0) {
+	syslog(0, "kmodloader: loading kernel modules from %s\n", path);
+
+	if (glob(path, gl_flags, NULL, &gl) >= 0) {
 		int j;
 
 		for (j = 0; j < gl.gl_pathc; j++) {
@@ -92,11 +615,20 @@ int main(int argc, char **argv)
 			if (!fp) {
 				fprintf(stderr, "failed to open %s\n", gl.gl_pathv[j]);
 			} else {
-				char mod[64];
+				char mod[256];
+
+				while (fgets(mod, sizeof(mod), fp)) {
+					char *nl = strchr(mod, '\n');
+					char *opts;
+
+					if (nl)
+						*nl = '\0';
+
+					opts = strchr(mod, ' ');
+					if (opts)
+						*opts++ = '\0';
 
-				while (fgets(mod, 64, fp)) {
-					mod[strlen(mod) - 1] = '\0';
-					insmod(mod, "");
+					insert_module(get_module_path(mod), (opts) ? (opts) : (""));
 				}
 				fclose(fp);
 			}
@@ -104,7 +636,29 @@ int main(int argc, char **argv)
 	}
 
 	globfree(&gl);
-	free(tmp);
+	free(path);
 
 	return 0;
 }
+
+int main(int argc, char **argv)
+{
+	char *exec = basename(*argv);
+
+	if (!strcmp(exec, "insmod"))
+		return main_insmod(argc, argv);
+
+	if (!strcmp(exec, "rmmod"))
+		return main_rmmod(argc, argv);
+
+	if (!strcmp(exec, "lsmod"))
+		return main_lsmod(argc, argv);
+
+	if (!strcmp(exec, "modinfo"))
+		return main_modinfo(argc, argv);
+
+	if (!strcmp(exec, "depmod"))
+		return main_depmod(argc, argv);
+
+	return main_loader(argc, argv);
+}