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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 | ||
11c3a4ee LP |
22 | #include <unistd.h> |
23 | #include <string.h> | |
f84f9974 LP |
24 | |
25 | #ifdef HAVE_KMOD | |
728beb28 | 26 | #include <libkmod.h> |
f84f9974 | 27 | #endif |
11c3a4ee LP |
28 | |
29 | #include "macro.h" | |
c47fc1f0 | 30 | #include "capability.h" |
11c3a4ee LP |
31 | #include "kmod-setup.h" |
32 | ||
f84f9974 | 33 | #ifdef HAVE_KMOD |
b4b87964 LP |
34 | static void systemd_kmod_log( |
35 | void *data, | |
36 | int priority, | |
37 | const char *file, int line, | |
38 | const char *fn, | |
39 | const char *format, | |
40 | va_list args) { | |
41 | ||
10223732 | 42 | /* library logging is enabled at debug only */ |
bcfce235 | 43 | DISABLE_WARNING_FORMAT_NONLITERAL; |
79008bdd | 44 | log_internalv(LOG_DEBUG, 0, file, line, fn, format, args); |
bcfce235 | 45 | REENABLE_WARNING; |
728beb28 | 46 | } |
b4b87964 | 47 | |
b43b8f7a | 48 | static bool cmdline_check_kdbus(void) { |
3da44ef5 | 49 | return get_proc_cmdline_key("kdbus", NULL) > 0; |
7491e6e7 | 50 | } |
f84f9974 | 51 | #endif |
b4b87964 | 52 | |
7491e6e7 | 53 | int kmod_setup(void) { |
f84f9974 | 54 | #ifdef HAVE_KMOD |
c47fc1f0 | 55 | |
7491e6e7 KS |
56 | static const struct { |
57 | const char *module; | |
58 | const char *path; | |
59 | bool warn; | |
60 | bool (*condition_fn)(void); | |
61 | } kmod_table[] = { | |
62 | /* auto-loading on use doesn't work before udev is up */ | |
68d4c452 | 63 | { "autofs4", "/sys/class/misc/autofs", true, NULL }, |
7491e6e7 KS |
64 | |
65 | /* early configure of ::1 on the loopback device */ | |
68d4c452 | 66 | { "ipv6", "/sys/module/ipv6", true, NULL }, |
7491e6e7 KS |
67 | |
68 | /* this should never be a module */ | |
68d4c452 | 69 | { "unix", "/proc/net/unix", true, NULL }, |
7491e6e7 KS |
70 | |
71 | /* IPC is needed before we bring up any other services */ | |
63cc4c31 | 72 | { "kdbus", "/sys/fs/kdbus", false, cmdline_check_kdbus }, |
7491e6e7 | 73 | }; |
728beb28 | 74 | struct kmod_ctx *ctx = NULL; |
7491e6e7 | 75 | unsigned int i; |
b4b87964 | 76 | int r; |
11c3a4ee | 77 | |
c47fc1f0 LP |
78 | if (have_effective_cap(CAP_SYS_MODULE) == 0) |
79 | return 0; | |
80 | ||
7491e6e7 | 81 | for (i = 0; i < ELEMENTSOF(kmod_table); i++) { |
b4b87964 | 82 | struct kmod_module *mod; |
11c3a4ee | 83 | |
b43b8f7a | 84 | if (kmod_table[i].path && access(kmod_table[i].path, F_OK) >= 0) |
7491e6e7 KS |
85 | continue; |
86 | ||
b43b8f7a | 87 | if (kmod_table[i].condition_fn && !kmod_table[i].condition_fn()) |
11c3a4ee LP |
88 | continue; |
89 | ||
7491e6e7 KS |
90 | if (kmod_table[i].warn) |
91 | log_debug("Your kernel apparently lacks built-in %s support. Might be " | |
92 | "a good idea to compile it in. We'll now try to work around " | |
93 | "this by loading the module...", kmod_table[i].module); | |
11c3a4ee | 94 | |
728beb28 TG |
95 | if (!ctx) { |
96 | ctx = kmod_new(NULL, NULL); | |
b4b87964 LP |
97 | if (!ctx) |
98 | return log_oom(); | |
11c3a4ee | 99 | |
728beb28 | 100 | kmod_set_log_fn(ctx, systemd_kmod_log, NULL); |
728beb28 TG |
101 | kmod_load_resources(ctx); |
102 | } | |
11c3a4ee | 103 | |
7491e6e7 | 104 | r = kmod_module_new_from_name(ctx, kmod_table[i].module, &mod); |
b4b87964 | 105 | if (r < 0) { |
7491e6e7 | 106 | log_error("Failed to lookup module '%s'", kmod_table[i].module); |
728beb28 TG |
107 | continue; |
108 | } | |
11c3a4ee | 109 | |
b4b87964 LP |
110 | r = kmod_module_probe_insert_module(mod, KMOD_PROBE_APPLY_BLACKLIST, NULL, NULL, NULL, NULL); |
111 | if (r == 0) | |
728beb28 | 112 | log_info("Inserted module '%s'", kmod_module_get_name(mod)); |
b4b87964 | 113 | else if (r == KMOD_PROBE_APPLY_BLACKLIST) |
728beb28 | 114 | log_info("Module '%s' is blacklisted", kmod_module_get_name(mod)); |
b43b8f7a | 115 | else if (kmod_table[i].warn) |
10223732 | 116 | log_error("Failed to insert module '%s'", kmod_module_get_name(mod)); |
11c3a4ee | 117 | |
728beb28 | 118 | kmod_module_unref(mod); |
11c3a4ee LP |
119 | } |
120 | ||
728beb28 | 121 | if (ctx) |
34a35ece | 122 | kmod_unref(ctx); |
728beb28 | 123 | |
f84f9974 | 124 | #endif |
728beb28 | 125 | return 0; |
11c3a4ee | 126 | } |