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 | |
| 20 | #include <stdio.h> |
| 21 | #include <stdlib.h> |
| 22 | #include <stddef.h> |
| 23 | #include <stdarg.h> |
| 24 | #include <unistd.h> |
| 25 | #include <errno.h> |
| 26 | #include <string.h> |
| 27 | #include <ctype.h> |
| 28 | #include <inttypes.h> |
| 29 | #include <sys/stat.h> |
| 30 | #include <sys/types.h> |
| 31 | #include <sys/mman.h> |
| 32 | #include <string.h> |
| 33 | |
| 34 | #include "libkmod.h" |
| 35 | #include "libkmod-private.h" |
| 36 | |
| 37 | /** |
| 38 | * kmod_module: |
| 39 | * |
| 40 | * Opaque object representing a module. |
| 41 | */ |
| 42 | struct kmod_module { |
| 43 | struct kmod_ctx *ctx; |
| 44 | int refcount; |
| 45 | const char *path; |
| 46 | const char *name; |
| 47 | }; |
| 48 | |
| 49 | static char *path_to_modname(const char *path) |
| 50 | { |
| 51 | char *modname; |
| 52 | char *c; |
| 53 | |
| 54 | modname = basename(path); |
| 55 | if (modname == NULL || modname[0] == '\0') |
| 56 | return NULL; |
| 57 | |
| 58 | modname = strdup(modname); |
| 59 | for (c = modname; *c != '\0' && *c != '.'; c++) { |
| 60 | if (*c == '-') |
| 61 | *c = '_'; |
| 62 | } |
| 63 | |
| 64 | *c = '\0'; |
| 65 | return modname; |
| 66 | } |
| 67 | |
| 68 | static const char *get_modname(struct kmod_module *mod) |
| 69 | { |
| 70 | if (mod->name == NULL) |
| 71 | mod->name = path_to_modname(mod->path); |
| 72 | |
| 73 | return mod->name; |
| 74 | } |
| 75 | |
| 76 | KMOD_EXPORT int kmod_module_new_from_name(struct kmod_ctx *ctx, |
| 77 | const char *name, |
| 78 | struct kmod_module **mod) |
| 79 | { |
| 80 | struct kmod_module *m; |
| 81 | |
| 82 | if (ctx == NULL || name == NULL) |
| 83 | return -ENOENT; |
| 84 | |
| 85 | m = calloc(1, sizeof(*m)); |
| 86 | if (m == NULL) { |
| 87 | free(m); |
| 88 | return -ENOMEM; |
| 89 | } |
| 90 | |
| 91 | m->ctx = kmod_ref(ctx); |
| 92 | m->name = strdup(name); |
| 93 | |
| 94 | *mod = m; |
| 95 | |
| 96 | return 0; |
| 97 | } |
| 98 | |
| 99 | KMOD_EXPORT int kmod_module_new_from_path(struct kmod_ctx *ctx, |
| 100 | const char *path, |
| 101 | struct kmod_module **mod) |
| 102 | { |
| 103 | struct kmod_module *m; |
| 104 | int err; |
| 105 | struct stat st; |
| 106 | |
| 107 | if (ctx == NULL || path == NULL) |
| 108 | return -ENOENT; |
| 109 | |
| 110 | err = stat(path, &st); |
| 111 | if (err < 0) |
| 112 | return -errno; |
| 113 | |
| 114 | m = calloc(1, sizeof(*m)); |
| 115 | if (m == NULL) { |
| 116 | free(m); |
| 117 | return -ENOMEM; |
| 118 | } |
| 119 | |
| 120 | m->ctx = kmod_ref(ctx); |
| 121 | m->path = strdup(path); |
| 122 | |
| 123 | *mod = m; |
| 124 | |
| 125 | return 0; |
| 126 | } |
| 127 | |
| 128 | KMOD_EXPORT struct kmod_module *kmod_module_unref(struct kmod_module *mod) |
| 129 | { |
| 130 | if (mod == NULL) |
| 131 | return NULL; |
| 132 | |
| 133 | if (--mod->refcount > 0) |
| 134 | return mod; |
| 135 | |
| 136 | DBG(mod->ctx, "kmod_module %p released\n", mod); |
| 137 | |
| 138 | kmod_unref(mod->ctx); |
| 139 | free((char *) mod->path); |
| 140 | free((char *) mod->name); |
| 141 | free(mod); |
| 142 | return NULL; |
| 143 | } |
| 144 | |
| 145 | KMOD_EXPORT struct kmod_module *kmod_module_ref(struct kmod_module *mod) |
| 146 | { |
| 147 | if (mod == NULL) |
| 148 | return NULL; |
| 149 | |
| 150 | mod->refcount++; |
| 151 | |
| 152 | return mod; |
| 153 | } |
| 154 | |
Lucas De Marchi | b14dcfd | 2011-11-30 20:29:51 -0200 | [diff] [blame] | 155 | #define CHECK_ERR_AND_FINISH(_err, _label_err, _list, label_finish) \ |
| 156 | do { \ |
| 157 | if ((_err) < 0) \ |
| 158 | goto _label_err; \ |
| 159 | if (*(_list) != NULL) \ |
| 160 | goto finish; \ |
| 161 | } while (0) |
| 162 | |
Lucas De Marchi | 7f3eb0c | 2011-11-30 19:03:41 -0200 | [diff] [blame] | 163 | KMOD_EXPORT int kmod_module_new_from_lookup(struct kmod_ctx *ctx, |
| 164 | const char *alias, |
| 165 | struct kmod_list **list) |
| 166 | { |
| 167 | |
| 168 | int err; |
| 169 | |
| 170 | if (ctx == NULL || alias == NULL) |
| 171 | return -ENOENT; |
| 172 | |
Lucas De Marchi | 7f3eb0c | 2011-11-30 19:03:41 -0200 | [diff] [blame] | 173 | if (list == NULL || *list != NULL) { |
| 174 | ERR(ctx, "An empty list is needed to create lookup\n"); |
| 175 | return -ENOSYS; |
| 176 | } |
| 177 | |
Lucas De Marchi | b14dcfd | 2011-11-30 20:29:51 -0200 | [diff] [blame] | 178 | /* Aliases from config file override all the others */ |
Lucas De Marchi | 7f3eb0c | 2011-11-30 19:03:41 -0200 | [diff] [blame] | 179 | err = kmod_lookup_alias_from_config(ctx, alias, list); |
Lucas De Marchi | b14dcfd | 2011-11-30 20:29:51 -0200 | [diff] [blame] | 180 | CHECK_ERR_AND_FINISH(err, fail, list, finish); |
Lucas De Marchi | 7f3eb0c | 2011-11-30 19:03:41 -0200 | [diff] [blame] | 181 | |
Lucas De Marchi | 64700e4 | 2011-12-01 15:57:53 -0200 | [diff] [blame] | 182 | err = kmod_lookup_alias_from_moddep_file(ctx, alias, list); |
| 183 | CHECK_ERR_AND_FINISH(err, fail, list, finish); |
| 184 | |
Lucas De Marchi | 9ba6f57 | 2011-11-30 20:31:45 -0200 | [diff] [blame] | 185 | err = kmod_lookup_alias_from_symbols_file(ctx, alias, list); |
| 186 | CHECK_ERR_AND_FINISH(err, fail, list, finish); |
Lucas De Marchi | b14dcfd | 2011-11-30 20:29:51 -0200 | [diff] [blame] | 187 | |
Lucas De Marchi | 49e61ca | 2011-12-01 16:27:04 -0200 | [diff] [blame^] | 188 | err = kmod_lookup_alias_from_aliases_file(ctx, alias, list); |
| 189 | CHECK_ERR_AND_FINISH(err, fail, list, finish); |
| 190 | |
Lucas De Marchi | b14dcfd | 2011-11-30 20:29:51 -0200 | [diff] [blame] | 191 | finish: |
Lucas De Marchi | 7f3eb0c | 2011-11-30 19:03:41 -0200 | [diff] [blame] | 192 | |
| 193 | return err; |
Lucas De Marchi | b14dcfd | 2011-11-30 20:29:51 -0200 | [diff] [blame] | 194 | fail: |
| 195 | kmod_module_unref_list(*list); |
| 196 | *list = NULL; |
Lucas De Marchi | 7f3eb0c | 2011-11-30 19:03:41 -0200 | [diff] [blame] | 197 | } |
Lucas De Marchi | b14dcfd | 2011-11-30 20:29:51 -0200 | [diff] [blame] | 198 | #undef CHECK_ERR_AND_FINISH |
| 199 | |
Lucas De Marchi | 7f3eb0c | 2011-11-30 19:03:41 -0200 | [diff] [blame] | 200 | |
| 201 | KMOD_EXPORT int kmod_module_unref_list(struct kmod_list *list) |
| 202 | { |
| 203 | for (; list != NULL; list = kmod_list_remove(list)) |
| 204 | kmod_module_unref(list->data); |
| 205 | |
| 206 | return 0; |
| 207 | } |
| 208 | |
Lucas De Marchi | 6e869df | 2011-11-30 19:01:01 -0200 | [diff] [blame] | 209 | KMOD_EXPORT struct kmod_module *kmod_module_get_module(struct kmod_list *l) |
| 210 | { |
| 211 | struct kmod_module *mod = l->data; |
| 212 | return kmod_module_ref(mod); |
| 213 | } |
| 214 | |
| 215 | KMOD_EXPORT const char *kmod_module_get_name(struct kmod_module *mod) |
| 216 | { |
| 217 | // FIXME calculate name if name == NULL |
| 218 | return mod->name; |
| 219 | } |
| 220 | |
| 221 | KMOD_EXPORT const char *kmod_module_get_path(struct kmod_module *mod) |
| 222 | { |
| 223 | // FIXME calculate path if path == NULL |
| 224 | return mod->path; |
| 225 | } |
| 226 | |
| 227 | |
Lucas De Marchi | 8f788d5 | 2011-11-25 01:22:56 -0200 | [diff] [blame] | 228 | extern long delete_module(const char *name, unsigned int flags); |
| 229 | |
| 230 | KMOD_EXPORT int kmod_module_remove_module(struct kmod_module *mod, |
| 231 | unsigned int flags) |
| 232 | { |
| 233 | int err; |
| 234 | const char *modname; |
| 235 | |
| 236 | if (mod == NULL) |
| 237 | return -ENOENT; |
| 238 | |
| 239 | /* Filter out other flags */ |
| 240 | flags &= (KMOD_REMOVE_FORCE | KMOD_REMOVE_NOWAIT); |
| 241 | |
| 242 | modname = get_modname(mod); |
| 243 | err = delete_module(modname, flags); |
| 244 | if (err != 0) { |
| 245 | ERR(mod->ctx, "Removing '%s': %s\n", modname, |
| 246 | strerror(-err)); |
| 247 | return err; |
| 248 | } |
| 249 | |
| 250 | return 0; |
| 251 | } |
| 252 | |
| 253 | extern long init_module(void *mem, unsigned long len, const char *args); |
| 254 | |
| 255 | KMOD_EXPORT int kmod_module_insert_module(struct kmod_module *mod, |
| 256 | unsigned int flags) |
| 257 | { |
| 258 | int err; |
| 259 | void *mmaped_file; |
| 260 | struct stat st; |
| 261 | int fd; |
| 262 | const char *args = ""; |
| 263 | |
| 264 | if (mod == NULL) |
| 265 | return -ENOENT; |
| 266 | |
| 267 | if (mod->path == NULL) { |
Lucas De Marchi | 1b2e26a | 2011-11-25 01:28:39 -0200 | [diff] [blame] | 268 | 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] | 269 | return -ENOSYS; |
| 270 | } |
| 271 | |
| 272 | if (flags != 0) |
Lucas De Marchi | 1b2e26a | 2011-11-25 01:28:39 -0200 | [diff] [blame] | 273 | INFO(mod->ctx, "Flags are not implemented yet\n"); |
Lucas De Marchi | 8f788d5 | 2011-11-25 01:22:56 -0200 | [diff] [blame] | 274 | |
| 275 | if ((fd = open(mod->path, O_RDONLY)) < 0) { |
| 276 | err = -errno; |
| 277 | return err; |
| 278 | } |
| 279 | |
| 280 | stat(mod->path, &st); |
| 281 | |
| 282 | if ((mmaped_file = mmap(0, st.st_size, PROT_READ, |
| 283 | MAP_PRIVATE, fd, 0)) == MAP_FAILED) { |
| 284 | close(fd); |
| 285 | return -errno; |
| 286 | } |
| 287 | |
| 288 | err = init_module(mmaped_file, st.st_size, args); |
| 289 | if (err < 0) |
Lucas De Marchi | 1b2e26a | 2011-11-25 01:28:39 -0200 | [diff] [blame] | 290 | ERR(mod->ctx, "Failed to insert module '%s'\n", mod->path); |
Lucas De Marchi | 8f788d5 | 2011-11-25 01:22:56 -0200 | [diff] [blame] | 291 | |
| 292 | munmap(mmaped_file, st.st_size); |
| 293 | close(fd); |
| 294 | |
| 295 | return err; |
| 296 | } |