1 /* SPDX-License-Identifier: LGPL-2.1+ */
3 This file is part of systemd.
5 Copyright 2010 Lennart Poettering
7 systemd is free software; you can redistribute it and/or modify it
8 under the terms of the GNU Lesser General Public License as published by
9 the Free Software Foundation; either version 2.1 of the License, or
10 (at your option) any later version.
12 systemd is distributed in the hope that it will be useful, but
13 WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Lesser General Public License for more details.
17 You should have received a copy of the GNU Lesser General Public License
18 along with systemd; If not, see <http://www.gnu.org/licenses/>.
29 #include "alloc-util.h"
31 #include "capability-util.h"
33 #include "kmod-setup.h"
35 #include "module-util.h"
36 #include "string-util.h"
39 static void systemd_kmod_log(
42 const char *file
, int line
,
47 /* library logging is enabled at debug only */
48 DISABLE_WARNING_FORMAT_NONLITERAL
;
49 log_internalv(LOG_DEBUG
, 0, file
, line
, fn
, format
, args
);
53 static int has_virtio_rng_nftw_cb(
55 const struct stat
*sb
,
59 _cleanup_free_
char *alias
= NULL
;
62 if ((FTW_D
== tflag
) && (ftwbuf
->level
> 2))
63 return FTW_SKIP_SUBTREE
;
68 if (!endswith(fpath
, "/modalias"))
71 r
= read_one_line_file(fpath
, &alias
);
73 return FTW_SKIP_SIBLINGS
;
75 if (startswith(alias
, "pci:v00001AF4d00001005"))
78 if (startswith(alias
, "pci:v00001AF4d00001044"))
81 return FTW_SKIP_SIBLINGS
;
84 static bool has_virtio_rng(void) {
85 return (nftw("/sys/devices/pci0000:00", has_virtio_rng_nftw_cb
, 64, FTW_MOUNT
|FTW_PHYS
|FTW_ACTIONRETVAL
) == FTW_STOP
);
89 int kmod_setup(void) {
95 bool warn_if_unavailable
:1;
96 bool warn_if_module
:1;
97 bool (*condition_fn
)(void);
99 /* auto-loading on use doesn't work before udev is up */
100 { "autofs4", "/sys/class/misc/autofs", true, false, NULL
},
102 /* early configure of ::1 on the loopback device */
103 { "ipv6", "/sys/module/ipv6", false, true, NULL
},
105 /* this should never be a module */
106 { "unix", "/proc/net/unix", true, true, NULL
},
109 /* netfilter is needed by networkd, nspawn among others, and cannot be autoloaded */
110 { "ip_tables", "/proc/net/ip_tables_names", false, false, NULL
},
112 /* virtio_rng would be loaded by udev later, but real entropy might be needed very early */
113 { "virtio_rng", NULL
, false, false, has_virtio_rng
},
115 _cleanup_(kmod_unrefp
) struct kmod_ctx
*ctx
= NULL
;
119 if (have_effective_cap(CAP_SYS_MODULE
) == 0)
122 for (i
= 0; i
< ELEMENTSOF(kmod_table
); i
++) {
123 _cleanup_(kmod_module_unrefp
) struct kmod_module
*mod
= NULL
;
125 if (kmod_table
[i
].path
&& access(kmod_table
[i
].path
, F_OK
) >= 0)
128 if (kmod_table
[i
].condition_fn
&& !kmod_table
[i
].condition_fn())
131 if (kmod_table
[i
].warn_if_module
)
132 log_debug("Your kernel apparently lacks built-in %s support. Might be "
133 "a good idea to compile it in. We'll now try to work around "
134 "this by loading the module...", kmod_table
[i
].module
);
137 ctx
= kmod_new(NULL
, NULL
);
141 kmod_set_log_fn(ctx
, systemd_kmod_log
, NULL
);
142 kmod_load_resources(ctx
);
145 r
= kmod_module_new_from_name(ctx
, kmod_table
[i
].module
, &mod
);
147 log_error("Failed to lookup module '%s'", kmod_table
[i
].module
);
151 r
= kmod_module_probe_insert_module(mod
, KMOD_PROBE_APPLY_BLACKLIST
, NULL
, NULL
, NULL
, NULL
);
153 log_debug("Inserted module '%s'", kmod_module_get_name(mod
));
154 else if (r
== KMOD_PROBE_APPLY_BLACKLIST
)
155 log_info("Module '%s' is blacklisted", kmod_module_get_name(mod
));
157 bool print_warning
= kmod_table
[i
].warn_if_unavailable
|| (r
< 0 && r
!= -ENOENT
);
159 log_full_errno(print_warning
? LOG_WARNING
: LOG_DEBUG
, r
,
160 "Failed to insert module '%s': %m", kmod_module_get_name(mod
));