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-rw-r--r--src/libcore/kmod-setup.c131
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diff --git a/src/libcore/kmod-setup.c b/src/libcore/kmod-setup.c
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+++ b/src/libcore/kmod-setup.c
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+/***
+ 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 "bus-util.h"
+#include "capability-util.h"
+#include "kmod-setup.h"
+#include "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 },
+
+ /* IPC is needed before we bring up any other services */
+ { "kdbus", "/sys/fs/kdbus", false, false, is_kdbus_wanted },
+
+#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;
+}