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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
11c3a4ee | 2 | |
6c1f72f6 | 3 | #include <ftw.h> |
11c3a4ee | 4 | #include <string.h> |
cf0fbc49 | 5 | #include <unistd.h> |
f84f9974 | 6 | |
6c1f72f6 | 7 | #include "alloc-util.h" |
d79acc30 | 8 | #include "bus-util.h" |
cf0fbc49 | 9 | #include "capability-util.h" |
6c1f72f6 | 10 | #include "fileio.h" |
11c3a4ee | 11 | #include "kmod-setup.h" |
cf0fbc49 | 12 | #include "macro.h" |
6c1f72f6 | 13 | #include "string-util.h" |
11c3a4ee | 14 | |
349cc4a5 | 15 | #if HAVE_KMOD |
8a8a4b6e ZJS |
16 | #include <libkmod.h> |
17 | #include "module-util.h" | |
18 | ||
b4b87964 LP |
19 | static void systemd_kmod_log( |
20 | void *data, | |
21 | int priority, | |
22 | const char *file, int line, | |
23 | const char *fn, | |
24 | const char *format, | |
25 | va_list args) { | |
26 | ||
10223732 | 27 | /* library logging is enabled at debug only */ |
bcfce235 | 28 | DISABLE_WARNING_FORMAT_NONLITERAL; |
79008bdd | 29 | log_internalv(LOG_DEBUG, 0, file, line, fn, format, args); |
bcfce235 | 30 | REENABLE_WARNING; |
728beb28 | 31 | } |
b4b87964 | 32 | |
6c1f72f6 HH |
33 | static int has_virtio_rng_nftw_cb( |
34 | const char *fpath, | |
35 | const struct stat *sb, | |
36 | int tflag, | |
37 | struct FTW *ftwbuf) { | |
38 | ||
39 | _cleanup_free_ char *alias = NULL; | |
40 | int r; | |
41 | ||
42 | if ((FTW_D == tflag) && (ftwbuf->level > 2)) | |
43 | return FTW_SKIP_SUBTREE; | |
44 | ||
45 | if (FTW_F != tflag) | |
46 | return FTW_CONTINUE; | |
47 | ||
48 | if (!endswith(fpath, "/modalias")) | |
49 | return FTW_CONTINUE; | |
50 | ||
51 | r = read_one_line_file(fpath, &alias); | |
52 | if (r < 0) | |
53 | return FTW_SKIP_SIBLINGS; | |
54 | ||
55 | if (startswith(alias, "pci:v00001AF4d00001005")) | |
56 | return FTW_STOP; | |
57 | ||
58 | if (startswith(alias, "pci:v00001AF4d00001044")) | |
59 | return FTW_STOP; | |
60 | ||
61 | return FTW_SKIP_SIBLINGS; | |
62 | } | |
63 | ||
64 | static bool has_virtio_rng(void) { | |
65 | return (nftw("/sys/devices/pci0000:00", has_virtio_rng_nftw_cb, 64, FTW_MOUNT|FTW_PHYS|FTW_ACTIONRETVAL) == FTW_STOP); | |
66 | } | |
95441cf2 | 67 | #endif |
6c1f72f6 | 68 | |
7491e6e7 | 69 | int kmod_setup(void) { |
349cc4a5 | 70 | #if HAVE_KMOD |
c47fc1f0 | 71 | |
7491e6e7 KS |
72 | static const struct { |
73 | const char *module; | |
74 | const char *path; | |
85c67553 DM |
75 | bool warn_if_unavailable:1; |
76 | bool warn_if_module:1; | |
7491e6e7 KS |
77 | bool (*condition_fn)(void); |
78 | } kmod_table[] = { | |
6755bb55 ZJS |
79 | /* This one we need to load explicitly, since auto-loading on use doesn't work |
80 | * before udev created the ghost device nodes, and we need it earlier than that. */ | |
85c67553 | 81 | { "autofs4", "/sys/class/misc/autofs", true, false, NULL }, |
7491e6e7 | 82 | |
6755bb55 ZJS |
83 | /* This one we need to load explicitly, since auto-loading of IPv6 is not done when |
84 | * we try to configure ::1 on the loopback device. */ | |
85c67553 | 85 | { "ipv6", "/sys/module/ipv6", false, true, NULL }, |
7491e6e7 | 86 | |
6755bb55 | 87 | /* This should never be a module */ |
85c67553 | 88 | { "unix", "/proc/net/unix", true, true, NULL }, |
7491e6e7 | 89 | |
349cc4a5 | 90 | #if HAVE_LIBIPTC |
1d308797 | 91 | /* netfilter is needed by networkd, nspawn among others, and cannot be autoloaded */ |
85c67553 | 92 | { "ip_tables", "/proc/net/ip_tables_names", false, false, NULL }, |
a363680f | 93 | #endif |
6c1f72f6 HH |
94 | /* virtio_rng would be loaded by udev later, but real entropy might be needed very early */ |
95 | { "virtio_rng", NULL, false, false, has_virtio_rng }, | |
7491e6e7 | 96 | }; |
232ac0d6 | 97 | _cleanup_(kmod_unrefp) struct kmod_ctx *ctx = NULL; |
14cb109d | 98 | unsigned i; |
11c3a4ee | 99 | |
c47fc1f0 LP |
100 | if (have_effective_cap(CAP_SYS_MODULE) == 0) |
101 | return 0; | |
102 | ||
7491e6e7 | 103 | for (i = 0; i < ELEMENTSOF(kmod_table); i++) { |
b43b8f7a | 104 | if (kmod_table[i].path && access(kmod_table[i].path, F_OK) >= 0) |
7491e6e7 KS |
105 | continue; |
106 | ||
b43b8f7a | 107 | if (kmod_table[i].condition_fn && !kmod_table[i].condition_fn()) |
11c3a4ee LP |
108 | continue; |
109 | ||
85c67553 | 110 | if (kmod_table[i].warn_if_module) |
7491e6e7 KS |
111 | log_debug("Your kernel apparently lacks built-in %s support. Might be " |
112 | "a good idea to compile it in. We'll now try to work around " | |
113 | "this by loading the module...", kmod_table[i].module); | |
11c3a4ee | 114 | |
728beb28 TG |
115 | if (!ctx) { |
116 | ctx = kmod_new(NULL, NULL); | |
b4b87964 LP |
117 | if (!ctx) |
118 | return log_oom(); | |
11c3a4ee | 119 | |
728beb28 | 120 | kmod_set_log_fn(ctx, systemd_kmod_log, NULL); |
728beb28 TG |
121 | kmod_load_resources(ctx); |
122 | } | |
11c3a4ee | 123 | |
81d7c696 | 124 | (void) module_load_and_warn(ctx, kmod_table[i].module, kmod_table[i].warn_if_unavailable); |
11c3a4ee LP |
125 | } |
126 | ||
f84f9974 | 127 | #endif |
728beb28 | 128 | return 0; |
11c3a4ee | 129 | } |