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1 | /*** | |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2010 Lennart Poettering | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
20 | #include <string.h> | |
21 | #include <unistd.h> | |
22 | ||
23 | #ifdef HAVE_KMOD | |
24 | #include <libkmod.h> | |
25 | #endif | |
26 | ||
27 | #include "bus-util.h" | |
28 | #include "capability-util.h" | |
29 | #include "kmod-setup.h" | |
30 | #include "macro.h" | |
31 | ||
32 | #ifdef HAVE_KMOD | |
33 | static void systemd_kmod_log( | |
34 | void *data, | |
35 | int priority, | |
36 | const char *file, int line, | |
37 | const char *fn, | |
38 | const char *format, | |
39 | va_list args) { | |
40 | ||
41 | /* library logging is enabled at debug only */ | |
42 | DISABLE_WARNING_FORMAT_NONLITERAL; | |
43 | log_internalv(LOG_DEBUG, 0, file, line, fn, format, args); | |
44 | REENABLE_WARNING; | |
45 | } | |
46 | #endif | |
47 | ||
48 | int kmod_setup(void) { | |
49 | #ifdef HAVE_KMOD | |
50 | ||
51 | static const struct { | |
52 | const char *module; | |
53 | const char *path; | |
54 | bool warn_if_unavailable:1; | |
55 | bool warn_if_module:1; | |
56 | bool (*condition_fn)(void); | |
57 | } kmod_table[] = { | |
58 | /* auto-loading on use doesn't work before udev is up */ | |
59 | { "autofs4", "/sys/class/misc/autofs", true, false, NULL }, | |
60 | ||
61 | /* early configure of ::1 on the loopback device */ | |
62 | { "ipv6", "/sys/module/ipv6", false, true, NULL }, | |
63 | ||
64 | /* this should never be a module */ | |
65 | { "unix", "/proc/net/unix", true, true, NULL }, | |
66 | ||
67 | #ifdef HAVE_LIBIPTC | |
68 | /* netfilter is needed by networkd, nspawn among others, and cannot be autoloaded */ | |
69 | { "ip_tables", "/proc/net/ip_tables_names", false, false, NULL }, | |
70 | #endif | |
71 | }; | |
72 | struct kmod_ctx *ctx = NULL; | |
73 | unsigned int i; | |
74 | int r; | |
75 | ||
76 | if (have_effective_cap(CAP_SYS_MODULE) == 0) | |
77 | return 0; | |
78 | ||
79 | for (i = 0; i < ELEMENTSOF(kmod_table); i++) { | |
80 | struct kmod_module *mod; | |
81 | ||
82 | if (kmod_table[i].path && access(kmod_table[i].path, F_OK) >= 0) | |
83 | continue; | |
84 | ||
85 | if (kmod_table[i].condition_fn && !kmod_table[i].condition_fn()) | |
86 | continue; | |
87 | ||
88 | if (kmod_table[i].warn_if_module) | |
89 | log_debug("Your kernel apparently lacks built-in %s support. Might be " | |
90 | "a good idea to compile it in. We'll now try to work around " | |
91 | "this by loading the module...", kmod_table[i].module); | |
92 | ||
93 | if (!ctx) { | |
94 | ctx = kmod_new(NULL, NULL); | |
95 | if (!ctx) | |
96 | return log_oom(); | |
97 | ||
98 | kmod_set_log_fn(ctx, systemd_kmod_log, NULL); | |
99 | kmod_load_resources(ctx); | |
100 | } | |
101 | ||
102 | r = kmod_module_new_from_name(ctx, kmod_table[i].module, &mod); | |
103 | if (r < 0) { | |
104 | log_error("Failed to lookup module '%s'", kmod_table[i].module); | |
105 | continue; | |
106 | } | |
107 | ||
108 | r = kmod_module_probe_insert_module(mod, KMOD_PROBE_APPLY_BLACKLIST, NULL, NULL, NULL, NULL); | |
109 | if (r == 0) | |
110 | log_debug("Inserted module '%s'", kmod_module_get_name(mod)); | |
111 | else if (r == KMOD_PROBE_APPLY_BLACKLIST) | |
112 | log_info("Module '%s' is blacklisted", kmod_module_get_name(mod)); | |
113 | else { | |
114 | bool print_warning = kmod_table[i].warn_if_unavailable || (r < 0 && r != -ENOENT); | |
115 | ||
116 | log_full_errno(print_warning ? LOG_WARNING : LOG_DEBUG, r, | |
117 | "Failed to insert module '%s': %m", kmod_module_get_name(mod)); | |
118 | } | |
119 | ||
120 | kmod_module_unref(mod); | |
121 | } | |
122 | ||
123 | if (ctx) | |
124 | kmod_unref(ctx); | |
125 | ||
126 | #endif | |
127 | return 0; | |
128 | } |