diff options
Diffstat (limited to 'src/grp-system/libcore/src/kmod-setup.c')
| -rw-r--r-- | src/grp-system/libcore/src/kmod-setup.c | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/src/grp-system/libcore/src/kmod-setup.c b/src/grp-system/libcore/src/kmod-setup.c new file mode 100644 index 0000000000..0f935380b2 --- /dev/null +++ b/src/grp-system/libcore/src/kmod-setup.c @@ -0,0 +1,128 @@ +/*** + This file is part of systemd. + + Copyright 2010 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <string.h> +#include <unistd.h> + +#ifdef HAVE_KMOD +#include <libkmod.h> +#endif + +#include "core/kmod-setup.h" +#include "sd-bus/bus-util.h" +#include "systemd-basic/capability-util.h" +#include "systemd-basic/macro.h" + +#ifdef HAVE_KMOD +static void systemd_kmod_log( + void *data, + int priority, + const char *file, int line, + const char *fn, + const char *format, + va_list args) { + + /* library logging is enabled at debug only */ + DISABLE_WARNING_FORMAT_NONLITERAL; + log_internalv(LOG_DEBUG, 0, file, line, fn, format, args); + REENABLE_WARNING; +} +#endif + +int kmod_setup(void) { +#ifdef HAVE_KMOD + + static const struct { + const char *module; + const char *path; + bool warn_if_unavailable:1; + bool warn_if_module:1; + bool (*condition_fn)(void); + } kmod_table[] = { + /* auto-loading on use doesn't work before udev is up */ + { "autofs4", "/sys/class/misc/autofs", true, false, NULL }, + + /* early configure of ::1 on the loopback device */ + { "ipv6", "/sys/module/ipv6", false, true, NULL }, + + /* this should never be a module */ + { "unix", "/proc/net/unix", true, true, NULL }, + +#ifdef HAVE_LIBIPTC + /* netfilter is needed by networkd, nspawn among others, and cannot be autoloaded */ + { "ip_tables", "/proc/net/ip_tables_names", false, false, NULL }, +#endif + }; + struct kmod_ctx *ctx = NULL; + unsigned int i; + int r; + + if (have_effective_cap(CAP_SYS_MODULE) == 0) + return 0; + + for (i = 0; i < ELEMENTSOF(kmod_table); i++) { + struct kmod_module *mod; + + if (kmod_table[i].path && access(kmod_table[i].path, F_OK) >= 0) + continue; + + if (kmod_table[i].condition_fn && !kmod_table[i].condition_fn()) + continue; + + if (kmod_table[i].warn_if_module) + log_debug("Your kernel apparently lacks built-in %s support. Might be " + "a good idea to compile it in. We'll now try to work around " + "this by loading the module...", kmod_table[i].module); + + if (!ctx) { + ctx = kmod_new(NULL, NULL); + if (!ctx) + return log_oom(); + + kmod_set_log_fn(ctx, systemd_kmod_log, NULL); + kmod_load_resources(ctx); + } + + r = kmod_module_new_from_name(ctx, kmod_table[i].module, &mod); + if (r < 0) { + log_error("Failed to lookup module '%s'", kmod_table[i].module); + continue; + } + + r = kmod_module_probe_insert_module(mod, KMOD_PROBE_APPLY_BLACKLIST, NULL, NULL, NULL, NULL); + if (r == 0) + log_debug("Inserted module '%s'", kmod_module_get_name(mod)); + else if (r == KMOD_PROBE_APPLY_BLACKLIST) + log_info("Module '%s' is blacklisted", kmod_module_get_name(mod)); + else { + bool print_warning = kmod_table[i].warn_if_unavailable || (r < 0 && r != -ENOENT); + + log_full_errno(print_warning ? LOG_WARNING : LOG_DEBUG, r, + "Failed to insert module '%s': %m", kmod_module_get_name(mod)); + } + + kmod_module_unref(mod); + } + + if (ctx) + kmod_unref(ctx); + +#endif + return 0; +} |