134 lines
4.7 KiB
C
134 lines
4.7 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <unistd.h>
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#include <string.h>
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#ifdef HAVE_KMOD
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#include <libkmod.h>
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#endif
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#include "macro.h"
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#include "capability.h"
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#include "bus-util.h"
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#include "kmod-setup.h"
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#ifdef HAVE_KMOD
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static void systemd_kmod_log(
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void *data,
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int priority,
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const char *file, int line,
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const char *fn,
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const char *format,
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va_list args) {
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/* library logging is enabled at debug only */
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DISABLE_WARNING_FORMAT_NONLITERAL;
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log_internalv(LOG_DEBUG, 0, file, line, fn, format, args);
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REENABLE_WARNING;
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}
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#endif
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int kmod_setup(void) {
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#ifdef HAVE_KMOD
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static const struct {
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const char *module;
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const char *path;
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bool warn_if_unavailable:1;
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bool warn_if_module:1;
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bool (*condition_fn)(void);
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} kmod_table[] = {
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/* auto-loading on use doesn't work before udev is up */
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{ "autofs4", "/sys/class/misc/autofs", true, false, NULL },
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/* early configure of ::1 on the loopback device */
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{ "ipv6", "/sys/module/ipv6", false, true, NULL },
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/* this should never be a module */
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{ "unix", "/proc/net/unix", true, true, NULL },
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/* IPC is needed before we bring up any other services */
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{ "kdbus", "/sys/fs/kdbus", false, false, is_kdbus_wanted },
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#ifdef HAVE_LIBIPTC
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/* netfilter is needed by networkd, nspawn among others, and cannot be autoloaded */
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{ "ip_tables", "/proc/net/ip_tables_names", false, false, NULL },
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#endif
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};
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struct kmod_ctx *ctx = NULL;
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unsigned int i;
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int r;
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if (have_effective_cap(CAP_SYS_MODULE) == 0)
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return 0;
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for (i = 0; i < ELEMENTSOF(kmod_table); i++) {
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struct kmod_module *mod;
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if (kmod_table[i].path && access(kmod_table[i].path, F_OK) >= 0)
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continue;
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if (kmod_table[i].condition_fn && !kmod_table[i].condition_fn())
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continue;
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if (kmod_table[i].warn_if_module)
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log_debug("Your kernel apparently lacks built-in %s support. Might be "
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"a good idea to compile it in. We'll now try to work around "
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"this by loading the module...", kmod_table[i].module);
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if (!ctx) {
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ctx = kmod_new(NULL, NULL);
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if (!ctx)
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return log_oom();
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kmod_set_log_fn(ctx, systemd_kmod_log, NULL);
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kmod_load_resources(ctx);
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}
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r = kmod_module_new_from_name(ctx, kmod_table[i].module, &mod);
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if (r < 0) {
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log_error("Failed to lookup module '%s'", kmod_table[i].module);
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continue;
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}
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r = kmod_module_probe_insert_module(mod, KMOD_PROBE_APPLY_BLACKLIST, NULL, NULL, NULL, NULL);
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if (r == 0)
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log_info("Inserted module '%s'", kmod_module_get_name(mod));
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else if (r == KMOD_PROBE_APPLY_BLACKLIST)
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log_info("Module '%s' is blacklisted", kmod_module_get_name(mod));
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else {
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bool print_warning = kmod_table[i].warn_if_unavailable || (r < 0 && r != -ENOSYS);
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log_full_errno(print_warning ? LOG_WARNING : LOG_DEBUG, r,
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"Failed to insert module '%s': %m", kmod_module_get_name(mod));
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}
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kmod_module_unref(mod);
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}
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if (ctx)
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kmod_unref(ctx);
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#endif
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return 0;
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}
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