#include <unistd.h>

#include <string.h>

#ifdef HAVE_KMOD

#include <libkmod.h>

#endif

#include "macro.h"

#include "capability.h"

#include "bus-util.h"

#include "kmod-setup.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_info("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 != -ENOSYS);

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;

}