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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 13:00:47 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 13:00:47 +0000 |
commit | 2cb7e0aaedad73b076ea18c6900b0e86c5760d79 (patch) | |
tree | da68ca54bb79f4080079bf0828acda937593a4e1 /src/core/kmod-setup.c | |
parent | Initial commit. (diff) | |
download | systemd-upstream.tar.xz systemd-upstream.zip |
Adding upstream version 247.3.upstream/247.3upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/core/kmod-setup.c | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/src/core/kmod-setup.c b/src/core/kmod-setup.c new file mode 100644 index 0000000..8a7f828 --- /dev/null +++ b/src/core/kmod-setup.c @@ -0,0 +1,127 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#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; +} |