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11c3a4ee LP |
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 | |
5430f7f2 LP |
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 | |
11c3a4ee LP |
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 | |
5430f7f2 | 14 | Lesser General Public License for more details. |
11c3a4ee | 15 | |
5430f7f2 | 16 | You should have received a copy of the GNU Lesser General Public License |
11c3a4ee LP |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
18 | ***/ | |
19 | ||
11c3a4ee | 20 | #include <string.h> |
cf0fbc49 | 21 | #include <unistd.h> |
f84f9974 LP |
22 | |
23 | #ifdef HAVE_KMOD | |
728beb28 | 24 | #include <libkmod.h> |
f84f9974 | 25 | #endif |
11c3a4ee | 26 | |
d79acc30 | 27 | #include "bus-util.h" |
cf0fbc49 | 28 | #include "capability-util.h" |
11c3a4ee | 29 | #include "kmod-setup.h" |
cf0fbc49 | 30 | #include "macro.h" |
11c3a4ee | 31 | |
f84f9974 | 32 | #ifdef HAVE_KMOD |
b4b87964 LP |
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 | ||
10223732 | 41 | /* library logging is enabled at debug only */ |
bcfce235 | 42 | DISABLE_WARNING_FORMAT_NONLITERAL; |
79008bdd | 43 | log_internalv(LOG_DEBUG, 0, file, line, fn, format, args); |
bcfce235 | 44 | REENABLE_WARNING; |
728beb28 | 45 | } |
f84f9974 | 46 | #endif |
b4b87964 | 47 | |
7491e6e7 | 48 | int kmod_setup(void) { |
f84f9974 | 49 | #ifdef HAVE_KMOD |
c47fc1f0 | 50 | |
7491e6e7 KS |
51 | static const struct { |
52 | const char *module; | |
53 | const char *path; | |
85c67553 DM |
54 | bool warn_if_unavailable:1; |
55 | bool warn_if_module:1; | |
7491e6e7 KS |
56 | bool (*condition_fn)(void); |
57 | } kmod_table[] = { | |
58 | /* auto-loading on use doesn't work before udev is up */ | |
85c67553 | 59 | { "autofs4", "/sys/class/misc/autofs", true, false, NULL }, |
7491e6e7 KS |
60 | |
61 | /* early configure of ::1 on the loopback device */ | |
85c67553 | 62 | { "ipv6", "/sys/module/ipv6", false, true, NULL }, |
7491e6e7 KS |
63 | |
64 | /* this should never be a module */ | |
85c67553 | 65 | { "unix", "/proc/net/unix", true, true, NULL }, |
7491e6e7 | 66 | |
a363680f | 67 | #ifdef HAVE_LIBIPTC |
1d308797 | 68 | /* netfilter is needed by networkd, nspawn among others, and cannot be autoloaded */ |
85c67553 | 69 | { "ip_tables", "/proc/net/ip_tables_names", false, false, NULL }, |
a363680f | 70 | #endif |
7491e6e7 | 71 | }; |
728beb28 | 72 | struct kmod_ctx *ctx = NULL; |
7491e6e7 | 73 | unsigned int i; |
b4b87964 | 74 | int r; |
11c3a4ee | 75 | |
c47fc1f0 LP |
76 | if (have_effective_cap(CAP_SYS_MODULE) == 0) |
77 | return 0; | |
78 | ||
7491e6e7 | 79 | for (i = 0; i < ELEMENTSOF(kmod_table); i++) { |
b4b87964 | 80 | struct kmod_module *mod; |
11c3a4ee | 81 | |
b43b8f7a | 82 | if (kmod_table[i].path && access(kmod_table[i].path, F_OK) >= 0) |
7491e6e7 KS |
83 | continue; |
84 | ||
b43b8f7a | 85 | if (kmod_table[i].condition_fn && !kmod_table[i].condition_fn()) |
11c3a4ee LP |
86 | continue; |
87 | ||
85c67553 | 88 | if (kmod_table[i].warn_if_module) |
7491e6e7 KS |
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); | |
11c3a4ee | 92 | |
728beb28 TG |
93 | if (!ctx) { |
94 | ctx = kmod_new(NULL, NULL); | |
b4b87964 LP |
95 | if (!ctx) |
96 | return log_oom(); | |
11c3a4ee | 97 | |
728beb28 | 98 | kmod_set_log_fn(ctx, systemd_kmod_log, NULL); |
728beb28 TG |
99 | kmod_load_resources(ctx); |
100 | } | |
11c3a4ee | 101 | |
7491e6e7 | 102 | r = kmod_module_new_from_name(ctx, kmod_table[i].module, &mod); |
b4b87964 | 103 | if (r < 0) { |
7491e6e7 | 104 | log_error("Failed to lookup module '%s'", kmod_table[i].module); |
728beb28 TG |
105 | continue; |
106 | } | |
11c3a4ee | 107 | |
b4b87964 LP |
108 | r = kmod_module_probe_insert_module(mod, KMOD_PROBE_APPLY_BLACKLIST, NULL, NULL, NULL, NULL); |
109 | if (r == 0) | |
149730fc | 110 | log_debug("Inserted module '%s'", kmod_module_get_name(mod)); |
b4b87964 | 111 | else if (r == KMOD_PROBE_APPLY_BLACKLIST) |
728beb28 | 112 | log_info("Module '%s' is blacklisted", kmod_module_get_name(mod)); |
78d298bb | 113 | else { |
e0465827 | 114 | bool print_warning = kmod_table[i].warn_if_unavailable || (r < 0 && r != -ENOENT); |
78d298bb DM |
115 | |
116 | log_full_errno(print_warning ? LOG_WARNING : LOG_DEBUG, r, | |
d814f990 | 117 | "Failed to insert module '%s': %m", kmod_module_get_name(mod)); |
78d298bb | 118 | } |
11c3a4ee | 119 | |
728beb28 | 120 | kmod_module_unref(mod); |
11c3a4ee LP |
121 | } |
122 | ||
728beb28 | 123 | if (ctx) |
34a35ece | 124 | kmod_unref(ctx); |
728beb28 | 125 | |
f84f9974 | 126 | #endif |
728beb28 | 127 | return 0; |
11c3a4ee | 128 | } |