libkmod/libkmod.h

   1 /*
   2  * libkmod - interface to kernel module operations
   3  *
   4  * Copyright (C) 2011-2013  ProFUSION embedded systems
   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; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #pragma once
  21 #ifndef _LIBKMOD_H_
  22 #define _LIBKMOD_H_
  23
  24 #include <fcntl.h>
  25 #include <stdarg.h>
  26 #include <stdbool.h>
  27 #include <inttypes.h>
  28
  29 #ifdef __cplusplus
  30 extern "C" {
  31 #endif
  32
  33 /*
  34  * kmod_ctx
  35  *
  36  * library user context - reads the config and system
  37  * environment, user variables, allows custom logging
  38  */
  39 struct kmod_ctx;
  40 struct kmod_ctx *kmod_new(const char *dirname, const char * const *config_paths);
  41 struct kmod_ctx *kmod_ref(struct kmod_ctx *ctx);
  42 struct kmod_ctx *kmod_unref(struct kmod_ctx *ctx);
  43 void kmod_set_log_fn(struct kmod_ctx *ctx,
  44                         void (*log_fn)(void *log_data,
  45                                         int priority, const char *file, int line,
  46                                         const char *fn, const char *format,
  47                                         va_list args),
  48                         const void *data);
  49 int kmod_get_log_priority(const struct kmod_ctx *ctx);
  50 void kmod_set_log_priority(struct kmod_ctx *ctx, int priority);
  51 void *kmod_get_userdata(const struct kmod_ctx *ctx);
  52 void kmod_set_userdata(struct kmod_ctx *ctx, const void *userdata);
  53
  54
  55 /*
  56  * Management of libkmod's resources
  57  */
  58 int kmod_load_resources(struct kmod_ctx *ctx);
  59 void kmod_unload_resources(struct kmod_ctx *ctx);
  60
  61 enum kmod_resources {
  62         KMOD_RESOURCES_OK = 0,
  63         KMOD_RESOURCES_MUST_RELOAD = 1,
  64         KMOD_RESOURCES_MUST_RECREATE = 2,
  65 };
  66 int kmod_validate_resources(struct kmod_ctx *ctx);
  67
  68 enum kmod_index {
  69         KMOD_INDEX_MODULES_DEP = 0,
  70         KMOD_INDEX_MODULES_ALIAS,
  71         KMOD_INDEX_MODULES_SYMBOL,
  72         KMOD_INDEX_MODULES_BUILTIN,
  73         /* Padding to make sure enum is not mapped to char */
  74         _KMOD_INDEX_PAD = (1 << 31),
  75 };
  76 int kmod_dump_index(struct kmod_ctx *ctx, enum kmod_index type, int fd);
  77
  78 /*
  79  * kmod_list
  80  *
  81  * access to kmod generated lists
  82  */
  83 struct kmod_list;
  84 struct kmod_list *kmod_list_next(const struct kmod_list *list,
  85                                                 const struct kmod_list *curr);
  86 struct kmod_list *kmod_list_prev(const struct kmod_list *list,
  87                                                 const struct kmod_list *curr);
  88 struct kmod_list *kmod_list_last(const struct kmod_list *list);
  89
  90 #define kmod_list_foreach(list_entry, first_entry) \
  91         for (list_entry = first_entry; \
  92                 list_entry != NULL; \
  93                 list_entry = kmod_list_next(first_entry, list_entry))
  94
  95 #define kmod_list_foreach_reverse(list_entry, first_entry) \
  96         for (list_entry = kmod_list_last(first_entry); \
  97                 list_entry != NULL; \
  98                 list_entry = kmod_list_prev(first_entry, list_entry))
  99
 100 /*
 101  * kmod_config_iter
 102  *
 103  * access to configuration lists - it allows to get each configuration's
 104  * key/value stored by kmod
 105  */
 106 struct kmod_config_iter;
 107 struct kmod_config_iter *kmod_config_get_blacklists(const struct kmod_ctx *ctx);
 108 struct kmod_config_iter *kmod_config_get_install_commands(const struct kmod_ctx *ctx);
 109 struct kmod_config_iter *kmod_config_get_remove_commands(const struct kmod_ctx *ctx);
 110 struct kmod_config_iter *kmod_config_get_aliases(const struct kmod_ctx *ctx);
 111 struct kmod_config_iter *kmod_config_get_options(const struct kmod_ctx *ctx);
 112 struct kmod_config_iter *kmod_config_get_softdeps(const struct kmod_ctx *ctx);
 113 const char *kmod_config_iter_get_key(const struct kmod_config_iter *iter);
 114 const char *kmod_config_iter_get_value(const struct kmod_config_iter *iter);
 115 bool kmod_config_iter_next(struct kmod_config_iter *iter);
 116 void kmod_config_iter_free_iter(struct kmod_config_iter *iter);
 117
 118 /*
 119  * kmod_module
 120  *
 121  * Operate on kernel modules
 122  */
 123 struct kmod_module;
 124 int kmod_module_new_from_name(struct kmod_ctx *ctx, const char *name,
 125                                                 struct kmod_module **mod);
 126 int kmod_module_new_from_path(struct kmod_ctx *ctx, const char *path,
 127                                                 struct kmod_module **mod);
 128 int kmod_module_new_from_lookup(struct kmod_ctx *ctx, const char *given_alias,
 129                                                 struct kmod_list **list);
 130 int kmod_module_new_from_loaded(struct kmod_ctx *ctx,
 131                                                 struct kmod_list **list);
 132
 133 struct kmod_module *kmod_module_ref(struct kmod_module *mod);
 134 struct kmod_module *kmod_module_unref(struct kmod_module *mod);
 135 int kmod_module_unref_list(struct kmod_list *list);
 136 struct kmod_module *kmod_module_get_module(const struct kmod_list *entry);
 137
 138
 139 /* Removal flags */
 140 enum kmod_remove {
 141         KMOD_REMOVE_FORCE = O_TRUNC,
 142         KMOD_REMOVE_NOWAIT = O_NONBLOCK, /* always set */
 143 };
 144
 145 /* Insertion flags */
 146 enum kmod_insert {
 147         KMOD_INSERT_FORCE_VERMAGIC = 0x1,
 148         KMOD_INSERT_FORCE_MODVERSION = 0x2,
 149 };
 150
 151 /* Flags to kmod_module_probe_insert_module() */
 152 enum kmod_probe {
 153         KMOD_PROBE_FORCE_VERMAGIC =             0x00001,
 154         KMOD_PROBE_FORCE_MODVERSION =           0x00002,
 155         KMOD_PROBE_IGNORE_COMMAND =             0x00004,
 156         KMOD_PROBE_IGNORE_LOADED =              0x00008,
 157         KMOD_PROBE_DRY_RUN =                    0x00010,
 158         KMOD_PROBE_FAIL_ON_LOADED =             0x00020,
 159
 160         /* codes below can be used in return value, too */
 161         KMOD_PROBE_APPLY_BLACKLIST_ALL =        0x10000,
 162         KMOD_PROBE_APPLY_BLACKLIST =            0x20000,
 163         KMOD_PROBE_APPLY_BLACKLIST_ALIAS_ONLY = 0x40000,
 164 };
 165
 166 /* Flags to kmod_module_apply_filter() */
 167 enum kmod_filter {
 168         KMOD_FILTER_BLACKLIST = 0x00001,
 169         KMOD_FILTER_BUILTIN = 0x00002,
 170 };
 171
 172 int kmod_module_remove_module(struct kmod_module *mod, unsigned int flags);
 173 int kmod_module_insert_module(struct kmod_module *mod, unsigned int flags,
 174                                                         const char *options);
 175 int kmod_module_probe_insert_module(struct kmod_module *mod,
 176                         unsigned int flags, const char *extra_options,
 177                         int (*run_install)(struct kmod_module *m,
 178                                                 const char *cmdline, void *data),
 179                         const void *data,
 180                         void (*print_action)(struct kmod_module *m, bool install,
 181                                                 const char *options));
 182
 183
 184 const char *kmod_module_get_name(const struct kmod_module *mod);
 185 const char *kmod_module_get_path(const struct kmod_module *mod);
 186 const char *kmod_module_get_options(const struct kmod_module *mod);
 187 const char *kmod_module_get_install_commands(const struct kmod_module *mod);
 188 const char *kmod_module_get_remove_commands(const struct kmod_module *mod);
 189 struct kmod_list *kmod_module_get_dependencies(const struct kmod_module *mod);
 190 int kmod_module_get_softdeps(const struct kmod_module *mod,
 191                                 struct kmod_list **pre, struct kmod_list **post);
 192 int kmod_module_get_filtered_blacklist(const struct kmod_ctx *ctx,
 193                                         const struct kmod_list *input,
 194                                         struct kmod_list **output) __attribute__ ((deprecated));
 195 int kmod_module_apply_filter(const struct kmod_ctx *ctx,
 196                                         enum kmod_filter filter_type,
 197                                         const struct kmod_list *input,
 198                                         struct kmod_list **output);
 199
 200
 201
 202 /*
 203  * Information regarding "live information" from module's state, as returned
 204  * by kernel
 205  */
 206
 207 enum kmod_module_initstate {
 208         KMOD_MODULE_BUILTIN = 0,
 209         KMOD_MODULE_LIVE,
 210         KMOD_MODULE_COMING,
 211         KMOD_MODULE_GOING,
 212         /* Padding to make sure enum is not mapped to char */
 213         _KMOD_MODULE_PAD = (1 << 31),
 214 };
 215 const char *kmod_module_initstate_str(enum kmod_module_initstate state);
 216 int kmod_module_get_initstate(const struct kmod_module *mod);
 217 int kmod_module_get_refcnt(const struct kmod_module *mod);
 218 struct kmod_list *kmod_module_get_holders(const struct kmod_module *mod);
 219 struct kmod_list *kmod_module_get_sections(const struct kmod_module *mod);
 220 const char *kmod_module_section_get_name(const struct kmod_list *entry);
 221 unsigned long kmod_module_section_get_address(const struct kmod_list *entry);
 222 void kmod_module_section_free_list(struct kmod_list *list);
 223 long kmod_module_get_size(const struct kmod_module *mod);
 224
 225
 226
 227 /*
 228  * Information retrieved from ELF headers and sections
 229  */
 230
 231 int kmod_module_get_info(const struct kmod_module *mod, struct kmod_list **list);
 232 const char *kmod_module_info_get_key(const struct kmod_list *entry);
 233 const char *kmod_module_info_get_value(const struct kmod_list *entry);
 234 void kmod_module_info_free_list(struct kmod_list *list);
 235
 236 int kmod_module_get_versions(const struct kmod_module *mod, struct kmod_list **list);
 237 const char *kmod_module_version_get_symbol(const struct kmod_list *entry);
 238 uint64_t kmod_module_version_get_crc(const struct kmod_list *entry);
 239 void kmod_module_versions_free_list(struct kmod_list *list);
 240
 241 int kmod_module_get_symbols(const struct kmod_module *mod, struct kmod_list **list);
 242 const char *kmod_module_symbol_get_symbol(const struct kmod_list *entry);
 243 uint64_t kmod_module_symbol_get_crc(const struct kmod_list *entry);
 244 void kmod_module_symbols_free_list(struct kmod_list *list);
 245
 246 enum kmod_symbol_bind {
 247         KMOD_SYMBOL_NONE = '\0',
 248         KMOD_SYMBOL_LOCAL = 'L',
 249         KMOD_SYMBOL_GLOBAL = 'G',
 250         KMOD_SYMBOL_WEAK = 'W',
 251         KMOD_SYMBOL_UNDEF = 'U'
 252 };
 253
 254 int kmod_module_get_dependency_symbols(const struct kmod_module *mod, struct kmod_list **list);
 255 const char *kmod_module_dependency_symbol_get_symbol(const struct kmod_list *entry);
 256 int kmod_module_dependency_symbol_get_bind(const struct kmod_list *entry);
 257 uint64_t kmod_module_dependency_symbol_get_crc(const struct kmod_list *entry);
 258 void kmod_module_dependency_symbols_free_list(struct kmod_list *list);
 259
 260 #ifdef __cplusplus
 261 } /* extern "C" */
 262 #endif
 263 #endif