Lucas De Marchi | 8f788d5 | 2011-11-25 01:22:56 -0200 | [diff] [blame] | 1 | /* |
| 2 | * libkmod - interface to kernel module operations |
| 3 | * |
| 4 | * Copyright (C) 2011 ProFUSION embedded systems |
Lucas De Marchi | 8f788d5 | 2011-11-25 01:22:56 -0200 | [diff] [blame] | 5 | * |
| 6 | * This library is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU Lesser General Public |
| 8 | * License as published by the Free Software Foundation version 2.1. |
| 9 | * |
| 10 | * This library is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | * Lesser General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU Lesser General Public |
| 16 | * License along with this library; if not, write to the Free Software |
| 17 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 18 | */ |
| 19 | |
Lucas De Marchi | 7636e72 | 2011-12-01 17:56:03 -0200 | [diff] [blame] | 20 | #include <assert.h> |
Lucas De Marchi | 8f788d5 | 2011-11-25 01:22:56 -0200 | [diff] [blame] | 21 | #include <stdio.h> |
| 22 | #include <stdlib.h> |
| 23 | #include <stddef.h> |
| 24 | #include <stdarg.h> |
| 25 | #include <unistd.h> |
| 26 | #include <errno.h> |
| 27 | #include <string.h> |
| 28 | #include <ctype.h> |
| 29 | #include <inttypes.h> |
| 30 | #include <sys/stat.h> |
| 31 | #include <sys/types.h> |
| 32 | #include <sys/mman.h> |
| 33 | #include <string.h> |
| 34 | |
| 35 | #include "libkmod.h" |
| 36 | #include "libkmod-private.h" |
| 37 | |
| 38 | /** |
| 39 | * kmod_module: |
| 40 | * |
| 41 | * Opaque object representing a module. |
| 42 | */ |
| 43 | struct kmod_module { |
| 44 | struct kmod_ctx *ctx; |
| 45 | int refcount; |
| 46 | const char *path; |
| 47 | const char *name; |
Lucas De Marchi | 7636e72 | 2011-12-01 17:56:03 -0200 | [diff] [blame] | 48 | struct kmod_list *dep; |
| 49 | |
| 50 | struct { |
| 51 | bool dep : 1; |
| 52 | } init; |
Lucas De Marchi | 8f788d5 | 2011-11-25 01:22:56 -0200 | [diff] [blame] | 53 | }; |
| 54 | |
Lucas De Marchi | 9eaad1f | 2011-12-01 17:18:24 -0200 | [diff] [blame] | 55 | static char *path_to_modname(const char *path, bool alloc) |
Lucas De Marchi | 8f788d5 | 2011-11-25 01:22:56 -0200 | [diff] [blame] | 56 | { |
| 57 | char *modname; |
| 58 | char *c; |
| 59 | |
| 60 | modname = basename(path); |
| 61 | if (modname == NULL || modname[0] == '\0') |
| 62 | return NULL; |
| 63 | |
Lucas De Marchi | 9eaad1f | 2011-12-01 17:18:24 -0200 | [diff] [blame] | 64 | if (alloc) |
| 65 | modname = strdup(modname); |
| 66 | |
Lucas De Marchi | 8f788d5 | 2011-11-25 01:22:56 -0200 | [diff] [blame] | 67 | for (c = modname; *c != '\0' && *c != '.'; c++) { |
| 68 | if (*c == '-') |
| 69 | *c = '_'; |
| 70 | } |
| 71 | |
| 72 | *c = '\0'; |
| 73 | return modname; |
| 74 | } |
| 75 | |
| 76 | static const char *get_modname(struct kmod_module *mod) |
| 77 | { |
| 78 | if (mod->name == NULL) |
Lucas De Marchi | 9eaad1f | 2011-12-01 17:18:24 -0200 | [diff] [blame] | 79 | mod->name = path_to_modname(mod->path, true); |
Lucas De Marchi | 8f788d5 | 2011-11-25 01:22:56 -0200 | [diff] [blame] | 80 | |
| 81 | return mod->name; |
| 82 | } |
| 83 | |
Lucas De Marchi | 7636e72 | 2011-12-01 17:56:03 -0200 | [diff] [blame] | 84 | int kmod_module_parse_dep(struct kmod_module *mod, char *line) |
| 85 | { |
| 86 | struct kmod_ctx *ctx = mod->ctx; |
| 87 | struct kmod_list *list = NULL; |
| 88 | char *p, *saveptr; |
| 89 | int err, n = 0; |
| 90 | |
| 91 | assert(!mod->init.dep && mod->dep == NULL); |
| 92 | mod->init.dep = true; |
| 93 | |
| 94 | p = strchr(line, ':'); |
| 95 | if (p == NULL) |
| 96 | return 0; |
| 97 | |
| 98 | p++; |
| 99 | |
| 100 | for (p = strtok_r(p, " \t", &saveptr); p != NULL; |
| 101 | p = strtok_r(NULL, " \t", &saveptr)) { |
| 102 | const char *modname = path_to_modname(p, false); |
Lucas De Marchi | 1fc1c9a | 2011-12-02 10:00:03 -0200 | [diff] [blame] | 103 | struct kmod_module *depmod; |
Lucas De Marchi | 7636e72 | 2011-12-01 17:56:03 -0200 | [diff] [blame] | 104 | |
Lucas De Marchi | 1fc1c9a | 2011-12-02 10:00:03 -0200 | [diff] [blame] | 105 | err = kmod_module_new_from_name(ctx, modname, &depmod); |
Lucas De Marchi | 7636e72 | 2011-12-01 17:56:03 -0200 | [diff] [blame] | 106 | if (err < 0) { |
| 107 | ERR(ctx, "ctx=%p modname=%s error=%s\n", |
| 108 | ctx, modname, strerror(-err)); |
| 109 | goto fail; |
| 110 | } |
| 111 | |
| 112 | DBG(ctx, "add dep: %s\n", modname); |
| 113 | |
Lucas De Marchi | 1fc1c9a | 2011-12-02 10:00:03 -0200 | [diff] [blame] | 114 | list = kmod_list_append(list, depmod); |
Lucas De Marchi | 7636e72 | 2011-12-01 17:56:03 -0200 | [diff] [blame] | 115 | n++; |
| 116 | } |
| 117 | |
| 118 | DBG(ctx, "%d dependencies for %s\n", n, mod->name); |
| 119 | |
| 120 | mod->dep = list; |
| 121 | return n; |
| 122 | |
| 123 | fail: |
| 124 | kmod_module_unref_list(list); |
| 125 | mod->init.dep = false; |
| 126 | return err; |
| 127 | } |
| 128 | |
Lucas De Marchi | 8f788d5 | 2011-11-25 01:22:56 -0200 | [diff] [blame] | 129 | KMOD_EXPORT int kmod_module_new_from_name(struct kmod_ctx *ctx, |
| 130 | const char *name, |
| 131 | struct kmod_module **mod) |
| 132 | { |
| 133 | struct kmod_module *m; |
| 134 | |
| 135 | if (ctx == NULL || name == NULL) |
| 136 | return -ENOENT; |
| 137 | |
| 138 | m = calloc(1, sizeof(*m)); |
| 139 | if (m == NULL) { |
| 140 | free(m); |
| 141 | return -ENOMEM; |
| 142 | } |
| 143 | |
| 144 | m->ctx = kmod_ref(ctx); |
| 145 | m->name = strdup(name); |
| 146 | |
| 147 | *mod = m; |
| 148 | |
| 149 | return 0; |
| 150 | } |
| 151 | |
| 152 | KMOD_EXPORT int kmod_module_new_from_path(struct kmod_ctx *ctx, |
| 153 | const char *path, |
| 154 | struct kmod_module **mod) |
| 155 | { |
| 156 | struct kmod_module *m; |
| 157 | int err; |
| 158 | struct stat st; |
| 159 | |
| 160 | if (ctx == NULL || path == NULL) |
| 161 | return -ENOENT; |
| 162 | |
| 163 | err = stat(path, &st); |
| 164 | if (err < 0) |
| 165 | return -errno; |
| 166 | |
| 167 | m = calloc(1, sizeof(*m)); |
| 168 | if (m == NULL) { |
| 169 | free(m); |
| 170 | return -ENOMEM; |
| 171 | } |
| 172 | |
| 173 | m->ctx = kmod_ref(ctx); |
| 174 | m->path = strdup(path); |
| 175 | |
| 176 | *mod = m; |
| 177 | |
| 178 | return 0; |
| 179 | } |
| 180 | |
| 181 | KMOD_EXPORT struct kmod_module *kmod_module_unref(struct kmod_module *mod) |
| 182 | { |
| 183 | if (mod == NULL) |
| 184 | return NULL; |
| 185 | |
| 186 | if (--mod->refcount > 0) |
| 187 | return mod; |
| 188 | |
| 189 | DBG(mod->ctx, "kmod_module %p released\n", mod); |
| 190 | |
Lucas De Marchi | 7636e72 | 2011-12-01 17:56:03 -0200 | [diff] [blame] | 191 | kmod_module_unref_list(mod->dep); |
Lucas De Marchi | 8f788d5 | 2011-11-25 01:22:56 -0200 | [diff] [blame] | 192 | kmod_unref(mod->ctx); |
| 193 | free((char *) mod->path); |
| 194 | free((char *) mod->name); |
| 195 | free(mod); |
| 196 | return NULL; |
| 197 | } |
| 198 | |
| 199 | KMOD_EXPORT struct kmod_module *kmod_module_ref(struct kmod_module *mod) |
| 200 | { |
| 201 | if (mod == NULL) |
| 202 | return NULL; |
| 203 | |
| 204 | mod->refcount++; |
| 205 | |
| 206 | return mod; |
| 207 | } |
| 208 | |
Lucas De Marchi | b14dcfd | 2011-11-30 20:29:51 -0200 | [diff] [blame] | 209 | #define CHECK_ERR_AND_FINISH(_err, _label_err, _list, label_finish) \ |
| 210 | do { \ |
| 211 | if ((_err) < 0) \ |
| 212 | goto _label_err; \ |
| 213 | if (*(_list) != NULL) \ |
| 214 | goto finish; \ |
| 215 | } while (0) |
| 216 | |
Lucas De Marchi | 7f3eb0c | 2011-11-30 19:03:41 -0200 | [diff] [blame] | 217 | KMOD_EXPORT int kmod_module_new_from_lookup(struct kmod_ctx *ctx, |
| 218 | const char *alias, |
| 219 | struct kmod_list **list) |
| 220 | { |
Lucas De Marchi | 7f3eb0c | 2011-11-30 19:03:41 -0200 | [diff] [blame] | 221 | int err; |
| 222 | |
| 223 | if (ctx == NULL || alias == NULL) |
| 224 | return -ENOENT; |
| 225 | |
Lucas De Marchi | 7f3eb0c | 2011-11-30 19:03:41 -0200 | [diff] [blame] | 226 | if (list == NULL || *list != NULL) { |
| 227 | ERR(ctx, "An empty list is needed to create lookup\n"); |
| 228 | return -ENOSYS; |
| 229 | } |
| 230 | |
Lucas De Marchi | b14dcfd | 2011-11-30 20:29:51 -0200 | [diff] [blame] | 231 | /* Aliases from config file override all the others */ |
Lucas De Marchi | 7f3eb0c | 2011-11-30 19:03:41 -0200 | [diff] [blame] | 232 | err = kmod_lookup_alias_from_config(ctx, alias, list); |
Lucas De Marchi | b14dcfd | 2011-11-30 20:29:51 -0200 | [diff] [blame] | 233 | CHECK_ERR_AND_FINISH(err, fail, list, finish); |
Lucas De Marchi | 7f3eb0c | 2011-11-30 19:03:41 -0200 | [diff] [blame] | 234 | |
Lucas De Marchi | 64700e4 | 2011-12-01 15:57:53 -0200 | [diff] [blame] | 235 | err = kmod_lookup_alias_from_moddep_file(ctx, alias, list); |
| 236 | CHECK_ERR_AND_FINISH(err, fail, list, finish); |
| 237 | |
Lucas De Marchi | 9ba6f57 | 2011-11-30 20:31:45 -0200 | [diff] [blame] | 238 | err = kmod_lookup_alias_from_symbols_file(ctx, alias, list); |
| 239 | CHECK_ERR_AND_FINISH(err, fail, list, finish); |
Lucas De Marchi | b14dcfd | 2011-11-30 20:29:51 -0200 | [diff] [blame] | 240 | |
Lucas De Marchi | 49e61ca | 2011-12-01 16:27:04 -0200 | [diff] [blame] | 241 | err = kmod_lookup_alias_from_aliases_file(ctx, alias, list); |
| 242 | CHECK_ERR_AND_FINISH(err, fail, list, finish); |
| 243 | |
Lucas De Marchi | b14dcfd | 2011-11-30 20:29:51 -0200 | [diff] [blame] | 244 | finish: |
Lucas De Marchi | 7f3eb0c | 2011-11-30 19:03:41 -0200 | [diff] [blame] | 245 | |
| 246 | return err; |
Lucas De Marchi | b14dcfd | 2011-11-30 20:29:51 -0200 | [diff] [blame] | 247 | fail: |
| 248 | kmod_module_unref_list(*list); |
| 249 | *list = NULL; |
Lucas De Marchi | 84f4220 | 2011-12-02 10:03:34 -0200 | [diff] [blame^] | 250 | return err; |
Lucas De Marchi | 7f3eb0c | 2011-11-30 19:03:41 -0200 | [diff] [blame] | 251 | } |
Lucas De Marchi | b14dcfd | 2011-11-30 20:29:51 -0200 | [diff] [blame] | 252 | #undef CHECK_ERR_AND_FINISH |
| 253 | |
Lucas De Marchi | 7f3eb0c | 2011-11-30 19:03:41 -0200 | [diff] [blame] | 254 | |
| 255 | KMOD_EXPORT int kmod_module_unref_list(struct kmod_list *list) |
| 256 | { |
| 257 | for (; list != NULL; list = kmod_list_remove(list)) |
| 258 | kmod_module_unref(list->data); |
| 259 | |
| 260 | return 0; |
| 261 | } |
| 262 | |
Lucas De Marchi | 0835fc3 | 2011-12-01 20:06:08 -0200 | [diff] [blame] | 263 | /* |
| 264 | * We don't increase the refcount. Maybe we should. |
| 265 | */ |
| 266 | KMOD_EXPORT struct kmod_list *kmod_module_get_dependency(struct kmod_module *mod) |
| 267 | { |
| 268 | // FIXME calculate dependency if it's not initialized |
| 269 | return mod->dep; |
| 270 | } |
| 271 | |
Lucas De Marchi | 6e869df | 2011-11-30 19:01:01 -0200 | [diff] [blame] | 272 | KMOD_EXPORT struct kmod_module *kmod_module_get_module(struct kmod_list *l) |
| 273 | { |
| 274 | struct kmod_module *mod = l->data; |
| 275 | return kmod_module_ref(mod); |
| 276 | } |
| 277 | |
| 278 | KMOD_EXPORT const char *kmod_module_get_name(struct kmod_module *mod) |
| 279 | { |
| 280 | // FIXME calculate name if name == NULL |
| 281 | return mod->name; |
| 282 | } |
| 283 | |
| 284 | KMOD_EXPORT const char *kmod_module_get_path(struct kmod_module *mod) |
| 285 | { |
| 286 | // FIXME calculate path if path == NULL |
| 287 | return mod->path; |
| 288 | } |
| 289 | |
| 290 | |
Lucas De Marchi | 8f788d5 | 2011-11-25 01:22:56 -0200 | [diff] [blame] | 291 | extern long delete_module(const char *name, unsigned int flags); |
| 292 | |
| 293 | KMOD_EXPORT int kmod_module_remove_module(struct kmod_module *mod, |
| 294 | unsigned int flags) |
| 295 | { |
| 296 | int err; |
| 297 | const char *modname; |
| 298 | |
| 299 | if (mod == NULL) |
| 300 | return -ENOENT; |
| 301 | |
| 302 | /* Filter out other flags */ |
| 303 | flags &= (KMOD_REMOVE_FORCE | KMOD_REMOVE_NOWAIT); |
| 304 | |
| 305 | modname = get_modname(mod); |
| 306 | err = delete_module(modname, flags); |
| 307 | if (err != 0) { |
| 308 | ERR(mod->ctx, "Removing '%s': %s\n", modname, |
| 309 | strerror(-err)); |
| 310 | return err; |
| 311 | } |
| 312 | |
| 313 | return 0; |
| 314 | } |
| 315 | |
| 316 | extern long init_module(void *mem, unsigned long len, const char *args); |
| 317 | |
| 318 | KMOD_EXPORT int kmod_module_insert_module(struct kmod_module *mod, |
| 319 | unsigned int flags) |
| 320 | { |
| 321 | int err; |
| 322 | void *mmaped_file; |
| 323 | struct stat st; |
| 324 | int fd; |
| 325 | const char *args = ""; |
| 326 | |
| 327 | if (mod == NULL) |
| 328 | return -ENOENT; |
| 329 | |
| 330 | if (mod->path == NULL) { |
Lucas De Marchi | 1b2e26a | 2011-11-25 01:28:39 -0200 | [diff] [blame] | 331 | ERR(mod->ctx, "Not supported to load a module by name yet\n"); |
Lucas De Marchi | 8f788d5 | 2011-11-25 01:22:56 -0200 | [diff] [blame] | 332 | return -ENOSYS; |
| 333 | } |
| 334 | |
| 335 | if (flags != 0) |
Lucas De Marchi | 1b2e26a | 2011-11-25 01:28:39 -0200 | [diff] [blame] | 336 | INFO(mod->ctx, "Flags are not implemented yet\n"); |
Lucas De Marchi | 8f788d5 | 2011-11-25 01:22:56 -0200 | [diff] [blame] | 337 | |
| 338 | if ((fd = open(mod->path, O_RDONLY)) < 0) { |
| 339 | err = -errno; |
| 340 | return err; |
| 341 | } |
| 342 | |
Lucas De Marchi | b418a82 | 2011-12-01 23:13:27 -0200 | [diff] [blame] | 343 | fstat(fd, &st); |
Lucas De Marchi | 8f788d5 | 2011-11-25 01:22:56 -0200 | [diff] [blame] | 344 | |
| 345 | if ((mmaped_file = mmap(0, st.st_size, PROT_READ, |
| 346 | MAP_PRIVATE, fd, 0)) == MAP_FAILED) { |
| 347 | close(fd); |
| 348 | return -errno; |
| 349 | } |
| 350 | |
| 351 | err = init_module(mmaped_file, st.st_size, args); |
| 352 | if (err < 0) |
Lucas De Marchi | 1b2e26a | 2011-11-25 01:28:39 -0200 | [diff] [blame] | 353 | ERR(mod->ctx, "Failed to insert module '%s'\n", mod->path); |
Lucas De Marchi | 8f788d5 | 2011-11-25 01:22:56 -0200 | [diff] [blame] | 354 | |
| 355 | munmap(mmaped_file, st.st_size); |
| 356 | close(fd); |
| 357 | |
| 358 | return err; |
| 359 | } |