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d6c9574f | 1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
11c3a4ee LP |
2 | |
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
9 | under the terms of the GNU Lesser General Public License as published by |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11c3a4ee LP |
11 | (at your option) any later version. |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 16 | Lesser General Public License for more details. |
11c3a4ee | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
11c3a4ee LP |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
22 | #include <sys/wait.h> | |
23 | #include <unistd.h> | |
24 | #include <string.h> | |
25 | #include <errno.h> | |
f84f9974 LP |
26 | |
27 | #ifdef HAVE_KMOD | |
728beb28 | 28 | #include <libkmod.h> |
f84f9974 | 29 | #endif |
11c3a4ee LP |
30 | |
31 | #include "macro.h" | |
32 | #include "execute.h" | |
c47fc1f0 | 33 | #include "capability.h" |
11c3a4ee LP |
34 | #include "kmod-setup.h" |
35 | ||
f84f9974 | 36 | #ifdef HAVE_KMOD |
b4b87964 LP |
37 | static void systemd_kmod_log( |
38 | void *data, | |
39 | int priority, | |
40 | const char *file, int line, | |
41 | const char *fn, | |
42 | const char *format, | |
43 | va_list args) { | |
44 | ||
10223732 | 45 | /* library logging is enabled at debug only */ |
bcfce235 | 46 | DISABLE_WARNING_FORMAT_NONLITERAL; |
086891e5 | 47 | log_metav(LOG_DEBUG, 0, file, line, fn, format, args); |
bcfce235 | 48 | REENABLE_WARNING; |
728beb28 | 49 | } |
b4b87964 | 50 | |
b43b8f7a | 51 | static bool cmdline_check_kdbus(void) { |
7491e6e7 | 52 | _cleanup_free_ char *line = NULL; |
5f68e74b LP |
53 | const char *p; |
54 | int r; | |
b4b87964 | 55 | |
5f68e74b LP |
56 | r = proc_cmdline(&line); |
57 | if (r < 0) | |
7491e6e7 | 58 | return false; |
b4b87964 | 59 | |
5f68e74b LP |
60 | p = line; |
61 | for (;;) { | |
62 | _cleanup_free_ char *word = NULL; | |
63 | ||
64 | r = unquote_first_word(&p, &word, true); | |
65 | if (r <= 0) | |
66 | return false; | |
67 | ||
68 | if (streq(word, "kdbus")) | |
69 | return true; | |
70 | } | |
7491e6e7 | 71 | } |
f84f9974 | 72 | #endif |
b4b87964 | 73 | |
7491e6e7 | 74 | int kmod_setup(void) { |
f84f9974 | 75 | #ifdef HAVE_KMOD |
c47fc1f0 | 76 | |
7491e6e7 KS |
77 | static const struct { |
78 | const char *module; | |
79 | const char *path; | |
80 | bool warn; | |
81 | bool (*condition_fn)(void); | |
82 | } kmod_table[] = { | |
83 | /* auto-loading on use doesn't work before udev is up */ | |
68d4c452 | 84 | { "autofs4", "/sys/class/misc/autofs", true, NULL }, |
7491e6e7 KS |
85 | |
86 | /* early configure of ::1 on the loopback device */ | |
68d4c452 | 87 | { "ipv6", "/sys/module/ipv6", true, NULL }, |
7491e6e7 KS |
88 | |
89 | /* this should never be a module */ | |
68d4c452 | 90 | { "unix", "/proc/net/unix", true, NULL }, |
7491e6e7 KS |
91 | |
92 | /* IPC is needed before we bring up any other services */ | |
63cc4c31 | 93 | { "kdbus", "/sys/fs/kdbus", false, cmdline_check_kdbus }, |
7491e6e7 | 94 | }; |
728beb28 | 95 | struct kmod_ctx *ctx = NULL; |
7491e6e7 | 96 | unsigned int i; |
b4b87964 | 97 | int r; |
11c3a4ee | 98 | |
c47fc1f0 LP |
99 | if (have_effective_cap(CAP_SYS_MODULE) == 0) |
100 | return 0; | |
101 | ||
7491e6e7 | 102 | for (i = 0; i < ELEMENTSOF(kmod_table); i++) { |
b4b87964 | 103 | struct kmod_module *mod; |
11c3a4ee | 104 | |
b43b8f7a | 105 | if (kmod_table[i].path && access(kmod_table[i].path, F_OK) >= 0) |
7491e6e7 KS |
106 | continue; |
107 | ||
b43b8f7a | 108 | if (kmod_table[i].condition_fn && !kmod_table[i].condition_fn()) |
11c3a4ee LP |
109 | continue; |
110 | ||
7491e6e7 KS |
111 | if (kmod_table[i].warn) |
112 | log_debug("Your kernel apparently lacks built-in %s support. Might be " | |
113 | "a good idea to compile it in. We'll now try to work around " | |
114 | "this by loading the module...", kmod_table[i].module); | |
11c3a4ee | 115 | |
728beb28 TG |
116 | if (!ctx) { |
117 | ctx = kmod_new(NULL, NULL); | |
b4b87964 LP |
118 | if (!ctx) |
119 | return log_oom(); | |
11c3a4ee | 120 | |
728beb28 | 121 | kmod_set_log_fn(ctx, systemd_kmod_log, NULL); |
728beb28 TG |
122 | kmod_load_resources(ctx); |
123 | } | |
11c3a4ee | 124 | |
7491e6e7 | 125 | r = kmod_module_new_from_name(ctx, kmod_table[i].module, &mod); |
b4b87964 | 126 | if (r < 0) { |
7491e6e7 | 127 | log_error("Failed to lookup module '%s'", kmod_table[i].module); |
728beb28 TG |
128 | continue; |
129 | } | |
11c3a4ee | 130 | |
b4b87964 LP |
131 | r = kmod_module_probe_insert_module(mod, KMOD_PROBE_APPLY_BLACKLIST, NULL, NULL, NULL, NULL); |
132 | if (r == 0) | |
728beb28 | 133 | log_info("Inserted module '%s'", kmod_module_get_name(mod)); |
b4b87964 | 134 | else if (r == KMOD_PROBE_APPLY_BLACKLIST) |
728beb28 | 135 | log_info("Module '%s' is blacklisted", kmod_module_get_name(mod)); |
b43b8f7a | 136 | else if (kmod_table[i].warn) |
10223732 | 137 | log_error("Failed to insert module '%s'", kmod_module_get_name(mod)); |
11c3a4ee | 138 | |
728beb28 | 139 | kmod_module_unref(mod); |
11c3a4ee LP |
140 | } |
141 | ||
728beb28 | 142 | if (ctx) |
34a35ece | 143 | kmod_unref(ctx); |
728beb28 | 144 | |
f84f9974 | 145 | #endif |
728beb28 | 146 | return 0; |
11c3a4ee | 147 | } |