src/core/kmod-setup.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   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
   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
  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
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  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>
  26 #include <libkmod.h>
  27
  28 #include "macro.h"
  29 #include "execute.h"
  30
  31 #include "kmod-setup.h"
  32
  33 #pragma GCC diagnostic push
  34 #pragma GCC diagnostic ignored "-Wformat-nonliteral"
  35
  36 static void systemd_kmod_log(
  37                 void *data,
  38                 int priority,
  39                 const char *file, int line,
  40                 const char *fn,
  41                 const char *format,
  42                 va_list args) {
  43
  44         /* library logging is enabled at debug only */
  45         log_metav(LOG_DEBUG, file, line, fn, format, args);
  46 }
  47
  48 #pragma GCC diagnostic pop
  49
  50 int kmod_setup(void) {
  51
  52         static const char kmod_table[] =
  53                 /* This one we need to load explicitly, since
  54                  * auto-loading on use doesn't work before udev
  55                  * created the ghost device nodes, and we need it
  56                  * earlier than that. */
  57                 "autofs4\0" "/sys/class/misc/autofs\0"
  58
  59                 /* This one we need to load explicitly, since
  60                  * auto-loading of IPv6 is not done when we try to
  61                  * configure ::1 on the loopback device. */
  62                 "ipv6\0"    "/sys/module/ipv6\0"
  63
  64                 "unix\0"    "/proc/net/unix\0";
  65
  66         struct kmod_ctx *ctx = NULL;
  67         const char *name, *path;
  68         int r;
  69
  70         NULSTR_FOREACH_PAIR(name, path, kmod_table) {
  71                 struct kmod_module *mod;
  72
  73                 if (access(path, F_OK) >= 0)
  74                         continue;
  75
  76                 log_debug("Your kernel apparently lacks built-in %s support. Might be a good idea to compile it in. "
  77                           "We'll now try to work around this by loading the module...",
  78                           name);
  79
  80                 if (!ctx) {
  81                         ctx = kmod_new(NULL, NULL);
  82                         if (!ctx)
  83                                 return log_oom();
  84
  85                         kmod_set_log_fn(ctx, systemd_kmod_log, NULL);
  86                         kmod_load_resources(ctx);
  87                 }
  88
  89                 r = kmod_module_new_from_name(ctx, name, &mod);
  90                 if (r < 0) {
  91                         log_error("Failed to lookup module '%s'", name);
  92                         continue;
  93                 }
  94
  95                 r = kmod_module_probe_insert_module(mod, KMOD_PROBE_APPLY_BLACKLIST, NULL, NULL, NULL, NULL);
  96                 if (r == 0)
  97                         log_info("Inserted module '%s'", kmod_module_get_name(mod));
  98                 else if (r == KMOD_PROBE_APPLY_BLACKLIST)
  99                         log_info("Module '%s' is blacklisted", kmod_module_get_name(mod));
 100                 else
 101                         log_error("Failed to insert module '%s'", kmod_module_get_name(mod));
 102
 103                 kmod_module_unref(mod);
 104         }
 105
 106         if (ctx)
 107                 kmod_unref(ctx);
 108
 109         return 0;
 110 }