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/* SPDX-License-Identifier: LGPL-2.1+ */
#include <ftw.h>
#include <unistd.h>
#include "alloc-util.h"
#include "bus-util.h"
#include "capability-util.h"
#include "fileio.h"
#include "kmod-setup.h"
#include "macro.h"
#include "string-util.h"
#if HAVE_KMOD
#include "module-util.h"
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;
}
static int has_virtio_rng_nftw_cb(
const char *fpath,
const struct stat *sb,
int tflag,
struct FTW *ftwbuf) {
_cleanup_free_ char *alias = NULL;
int r;
if ((FTW_D == tflag) && (ftwbuf->level > 2))
return FTW_SKIP_SUBTREE;
if (FTW_F != tflag)
return FTW_CONTINUE;
if (!endswith(fpath, "/modalias"))
return FTW_CONTINUE;
r = read_one_line_file(fpath, &alias);
if (r < 0)
return FTW_SKIP_SIBLINGS;
if (startswith(alias, "pci:v00001AF4d00001005"))
return FTW_STOP;
if (startswith(alias, "pci:v00001AF4d00001044"))
return FTW_STOP;
return FTW_SKIP_SIBLINGS;
}
static bool has_virtio_rng(void) {
return (nftw("/sys/devices/pci0000:00", has_virtio_rng_nftw_cb, 64, FTW_MOUNT|FTW_PHYS|FTW_ACTIONRETVAL) == FTW_STOP);
}
#endif
int kmod_setup(void) {
#if 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[] = {
/* This one we need to load explicitly, since auto-loading on use doesn't work
* before udev created the ghost device nodes, and we need it earlier than that. */
{ "autofs4", "/sys/class/misc/autofs", true, false, NULL },
/* This one we need to load explicitly, since auto-loading of IPv6 is not done when
* we try to configure ::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 },
#if 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
/* virtio_rng would be loaded by udev later, but real entropy might be needed very early */
{ "virtio_rng", NULL, false, false, has_virtio_rng },
};
_cleanup_(kmod_unrefp) struct kmod_ctx *ctx = NULL;
unsigned i;
if (have_effective_cap(CAP_SYS_MODULE) == 0)
return 0;
for (i = 0; i < ELEMENTSOF(kmod_table); i++) {
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);
}
(void) module_load_and_warn(ctx, kmod_table[i].module, kmod_table[i].warn_if_unavailable);
}
#endif
return 0;
}
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