1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
|
/* SPDX-License-Identifier: LGPL-2.1+ */
/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <ftw.h>
#include <string.h>
#include <unistd.h>
#if HAVE_KMOD
#include <libkmod.h>
#endif
#include "alloc-util.h"
#include "bus-util.h"
#include "capability-util.h"
#include "fileio.h"
#include "kmod-setup.h"
#include "macro.h"
#include "module-util.h"
#include "string-util.h"
#if 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;
}
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[] = {
/* 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 },
#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 int i;
int r;
if (have_effective_cap(CAP_SYS_MODULE) == 0)
return 0;
for (i = 0; i < ELEMENTSOF(kmod_table); i++) {
_cleanup_(kmod_module_unrefp) struct kmod_module *mod = NULL;
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_debug("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 != -ENOENT);
log_full_errno(print_warning ? LOG_WARNING : LOG_DEBUG, r,
"Failed to insert module '%s': %m", kmod_module_get_name(mod));
}
}
#endif
return 0;
}
|
