From 6efea338b33c265aca21e6826b81d332bcee9280 Mon Sep 17 00:00:00 2001 From: John Crispin Date: Mon, 19 Aug 2013 21:41:48 +0200 Subject: [PATCH] add proper modprobe support Signed-off-by: John Crispin --- kmodloader.c | 234 ++++++++++++++++++++++++++++++++++++--------------- 1 file changed, 167 insertions(+), 67 deletions(-) diff --git a/kmodloader.c b/kmodloader.c index 49899b3..83380e8 100644 --- a/kmodloader.c +++ b/kmodloader.c @@ -28,6 +28,7 @@ #include #include #include +#include #include #include @@ -37,11 +38,16 @@ #define DEF_MOD_PATH "/lib/modules/%s/" +#define LOG(fmt, ...) do { \ + syslog(LOG_INFO, fmt, ## __VA_ARGS__); \ + printf("kmod: "fmt, ## __VA_ARGS__); \ + } while (0) + + enum { SCANNED, PROBE, LOADED, - FAILED, }; struct module { @@ -53,6 +59,7 @@ struct module { int size; int usage; int state; + int error; }; static struct avl_tree modules; @@ -182,6 +189,7 @@ alloc_module(const char *name, const char *depends, int size) return NULL; m->avl.key = m->name = strcpy(_name, name); + if (depends) m->depends = strcpy(_dep, depends); @@ -198,7 +206,7 @@ static int scan_loaded_modules(void) fp = fopen("/proc/modules", "r"); if (!fp) { - fprintf(stderr, "failed to open /proc/modules\n"); + LOG("failed to open /proc/modules\n"); return -1; } @@ -233,23 +241,23 @@ static struct module* get_module_info(const char *module, const char *name) struct stat s; if (!fd) { - fprintf(stderr, "failed to open %s\n", module); + LOG("failed to open %s\n", module); return NULL; } if (fstat(fd, &s) == -1) { - fprintf(stderr, "failed to stat %s\n", module); + LOG("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); + LOG("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); + LOG("failed to load the .modinfo section from %s\n", module); return NULL; } @@ -279,13 +287,19 @@ static struct module* get_module_info(const char *module, const char *name) return m; } -static int scan_module_folder(char *dir) +static int scan_module_folder(void) { int gl_flags = GLOB_NOESCAPE | GLOB_MARK; - int j; + struct utsname ver; + char *path; glob_t gl; + int j; - if (glob(dir, gl_flags, NULL, &gl) < 0) + uname(&ver); + path = alloca(sizeof(DEF_MOD_PATH "*.ko") + strlen(ver.release) + 1); + sprintf(path, DEF_MOD_PATH "*.ko", ver.release); + + if (glob(path, gl_flags, NULL, &gl) < 0) return -1; for (j = 0; j < gl.gl_pathc; j++) { @@ -301,6 +315,7 @@ static int scan_module_folder(char *dir) } globfree(&gl); + free(path); return 0; } @@ -313,23 +328,23 @@ static int print_modinfo(char *module) char *map, *strings; if (!fd) { - fprintf(stderr, "failed to open %s\n", module); + LOG("failed to open %s\n", module); return -1; } if (fstat(fd, &s) == -1) { - fprintf(stderr, "failed to stat %s\n", module); + LOG("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); + LOG("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); + LOG("failed to load the .modinfo section from %s\n", module); return -1; } @@ -360,6 +375,39 @@ static int print_modinfo(char *module) return 0; } +static int deps_available(struct module *m, int verbose) +{ + char *deps, *_deps; + char *comma; + int err = 0; + + if (!strcmp(m->depends, "-") || !strcmp(m->depends, "")) + return 0; + + _deps = deps = strdup(m->depends); + + do { + comma = strstr(deps, ","); + if (comma) + *comma = '\0'; + + m = find_module(deps); + + if (verbose && !m) + LOG("missing dependency %s\n", deps); + if (verbose && m && (m->state != LOADED)) + LOG("dependency not loaded %s\n", deps); + if (!m || (m->state != LOADED)) + err++; + if (comma) + deps = ++comma; + } while (comma); + + free(_deps); + + return err; +} + static int insert_module(char *path, const char *options) { void *data = 0; @@ -367,24 +415,21 @@ static int insert_module(char *path, const char *options) int fd, ret = -1; if (stat(path, &s)) { - fprintf(stderr, "missing module %s\n", path); + LOG("missing module %s\n", path); return ret; } fd = open(path, O_RDONLY); if (!fd) { - fprintf(stderr, "cannot open %s\n", path); + LOG("cannot open %s\n", path); return ret; } data = malloc(s.st_size); - if (read(fd, data, s.st_size) == s.st_size) { + 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 to insert %s\n", path); - } else { - fprintf(stderr, "failed to read full module %s\n", path); - } + else + LOG("failed to read full module %s\n", path); close(fd); free(data); @@ -392,65 +437,90 @@ static int insert_module(char *path, const char *options) return ret; } -static int deps_available(struct module *m) +static void load_moddeps(struct module *_m) { - char *deps = m->depends; + char *deps, *_deps; + struct module *m; char *comma; - if (!strcmp(deps, "-")) - return 0; - while (*deps && (NULL != ((comma = strstr(deps, ","))))) { - *comma = '\0'; + if (!strcmp(_m->depends, "-") || !strcmp(_m->depends, "")) + return; + + _deps = deps = strdup(_m->depends); + + do { + char *t = deps; + + comma = strstr(deps, ","); + if (comma) + *comma = '\0'; m = find_module(deps); - if (!m || (m->state != LOADED)) - return -1; + if (!m) { + while (t && *t) { + if (*t == '-') + *t = '_'; + t++; + } + m = find_module(deps); + } - deps = ++comma; - } + if (!m) + LOG("failed to find dependency %s\n", deps); + if (m && (m->state != LOADED)) { + m->state = PROBE; + load_moddeps(m); + } - return 0; + if (comma) + deps = ++comma; + } while (comma); + + free(_deps); } -static int load_depmod(void) +static int load_modprobe(void) { int loaded, todo; struct module *m; + avl_for_each_element(&modules, m, avl) + if (m->state == PROBE) + load_moddeps(m); + do { loaded = 0; todo = 0; avl_for_each_element(&modules, m, avl) { - if ((m->state == PROBE) && (!deps_available(m))) { + if ((m->state == PROBE) && (!deps_available(m, 0))) { if (!insert_module(get_module_path(m->name), "")) { m->state = LOADED; + m->error = 0; loaded++; continue; } - m->state = FAILED; - } else if (m->state == PROBE) { - todo++; + m->error = 1; } + + if ((m->state == PROBE) || m->error) + todo++; } -// printf("loaded %d modules this pass\n", loaded); } while (loaded); -// printf("missing todos %d\n", todo); - - return -todo; + return todo; } static int print_insmod_usage(void) { - fprintf(stderr, "Usage:\n\tinsmod filename [args]\n"); + LOG("Usage:\n\tinsmod filename [args]\n"); return -1; } static int print_usage(char *arg) { - fprintf(stderr, "Usage:\n\t%s module\n", arg); + LOG("Usage:\n\t%s module\n", arg); return -1; } @@ -465,7 +535,7 @@ static int main_insmod(int argc, char **argv) name = get_module_name(argv[1]); if (!name) { - fprintf(stderr, "cannot find module - %s\n", argv[1]); + LOG("cannot find module - %s\n", argv[1]); return -1; } @@ -473,7 +543,7 @@ static int main_insmod(int argc, char **argv) return -1; if (find_module(name)) { - fprintf(stderr, "module is already loaded - %s\n", name); + LOG("module is already loaded - %s\n", name); return -1; } @@ -497,6 +567,9 @@ static int main_insmod(int argc, char **argv) ret = insert_module(get_module_path(name), options); free(options); + if (ret) + LOG("failed to insert %s\n", get_module_path(name)); + return ret; } @@ -515,7 +588,7 @@ static int main_rmmod(int argc, char **argv) name = get_module_name(argv[1]); m = find_module(name); if (!m) { - fprintf(stderr, "module is not loaded\n"); + LOG("module is not loaded\n"); return -1; } free_modules(); @@ -523,7 +596,7 @@ static int main_rmmod(int argc, char **argv) ret = syscall(__NR_delete_module, name, 0); if (ret) - fprintf(stderr, "unloading the module failed\n"); + LOG("unloading the module failed\n"); return ret; } @@ -555,7 +628,7 @@ static int main_modinfo(int argc, char **argv) module = get_module_path(argv[1]); if (!module) { - fprintf(stderr, "cannot find module - %s\n", argv[1]); + LOG("cannot find module - %s\n", argv[1]); return -1; } @@ -564,35 +637,42 @@ static int main_modinfo(int argc, char **argv) return 0; } -static int main_depmod(int argc, char **argv) +static int main_modprobe(int argc, char **argv) { - struct utsname ver; struct module *m; - char *path; char *name; if (argc != 2) - return print_usage("depmod"); + return print_usage("modprobe"); if (scan_loaded_modules()) return -1; - uname(&ver); - path = alloca(sizeof(DEF_MOD_PATH "*.ko") + strlen(ver.release) + 1); - sprintf(path, DEF_MOD_PATH "*.ko", ver.release); - - scan_module_folder(path); + if (scan_module_folder()) + return -1; name = get_module_name(argv[1]); m = find_module(name); if (m && m->state == LOADED) { - fprintf(stderr, "%s is already loaded\n", name); + LOG("%s is already loaded\n", name); return -1; } else if (!m) { - fprintf(stderr, "failed to find a module named %s\n", name); + LOG("failed to find a module named %s\n", name); } else { + int fail; + m->state = PROBE; - load_depmod(); + + fail = load_modprobe(); + + if (fail) { + LOG("%d module%s could not be probed\n", + fail, (fail == 1) ? ("") : ("s")); + + avl_for_each_element(&modules, m, avl) + if ((m->state == PROBE) || m->error) + LOG("- %s\n", m->name); + } } free_modules(); @@ -604,9 +684,10 @@ static int main_loader(int argc, char **argv) { int gl_flags = GLOB_NOESCAPE | GLOB_MARK; char *dir = "/etc/modules.d/*"; + struct module *m; glob_t gl; char *path; - int j; + int fail, j; if (argc > 1) dir = argv[1]; @@ -618,7 +699,11 @@ static int main_loader(int argc, char **argv) strcpy(path, dir); strcat(path, "*"); - scan_loaded_modules(); + if (scan_loaded_modules()) + return -1; + + if (scan_module_folder()) + return -1; syslog(0, "kmodloader: loading kernel modules from %s\n", path); @@ -631,7 +716,7 @@ static int main_loader(int argc, char **argv) char *mod = NULL; if (!fp) { - fprintf(stderr, "failed to open %s\n", gl.gl_pathv[j]); + LOG("failed to open %s\n", gl.gl_pathv[j]); continue; } @@ -648,14 +733,29 @@ static int main_loader(int argc, char **argv) *opts++ = '\0'; m = find_module(get_module_name(mod)); - if (m) + if (!m || (m->state == LOADED)) continue; - insert_module(get_module_path(mod), (opts) ? (opts) : ("")); + + m->state = PROBE; + if (basename(gl.gl_pathv[j])[0] - '0' <= 9) + load_modprobe(); + } free(mod); fclose(fp); } + fail = load_modprobe(); + + if (fail) { + LOG("%d module%s could not be probed\n", + fail, (fail == 1) ? ("") : ("s")); + + avl_for_each_element(&modules, m, avl) + if ((m->state == PROBE) || (m->error)) + LOG("- %s - %d\n", m->name, deps_available(m, 1)); + } + out: globfree(&gl); free(path); @@ -680,8 +780,8 @@ int main(int argc, char **argv) if (!strcmp(exec, "modinfo")) return main_modinfo(argc, argv); - if (!strcmp(exec, "depmod")) - return main_depmod(argc, argv); + if (!strcmp(exec, "modprobe")) + return main_modprobe(argc, argv); return main_loader(argc, argv); } -- 2.25.1