src/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 General Public License as published by
  10   the Free Software Foundation; either version 2 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   General Public License for more details.
  17
  18   You should have received a copy of the GNU 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 static const char * const kmod_table[] = {
  34         "autofs4", "/sys/class/misc/autofs",
  35         "ipv6",    "/sys/module/ipv6",
  36         "unix",    "/proc/net/unix"
  37 };
  38
  39 static void systemd_kmod_log(void *data, int priority, const char *file, int line,
  40                              const char *fn, const char *format, va_list args)
  41 {
  42         log_meta(priority, file, line, fn, format, args);
  43 }
  44
  45
  46 int kmod_setup(void) {
  47         unsigned i;
  48         struct kmod_ctx *ctx = NULL;
  49         struct kmod_module *mod;
  50         int err;
  51
  52         for (i = 0; i < ELEMENTSOF(kmod_table); i += 2) {
  53
  54                 if (access(kmod_table[i+1], F_OK) >= 0)
  55                         continue;
  56
  57                 log_debug("Your kernel apparently lacks built-in %s support. Might be a good idea to compile it in. "
  58                           "We'll now try to work around this by loading the module...",
  59                           kmod_table[i]);
  60
  61                 if (!ctx) {
  62                         ctx = kmod_new(NULL, NULL);
  63                         if (!ctx) {
  64                                 log_error("Failed to allocate memory for kmod");
  65                                 return -ENOMEM;
  66                         }
  67
  68                         kmod_set_log_fn(ctx, systemd_kmod_log, NULL);
  69
  70                         kmod_load_resources(ctx);
  71                 }
  72
  73                 err = kmod_module_new_from_name(ctx, kmod_table[i], &mod);
  74                 if (err < 0) {
  75                         log_error("Failed to load module '%s'", kmod_table[i]);
  76                         continue;
  77                 }
  78
  79                 err = kmod_module_probe_insert_module(mod, KMOD_PROBE_APPLY_BLACKLIST, NULL, NULL, NULL, NULL);
  80                 if (err == 0)
  81                         log_info("Inserted module '%s'", kmod_module_get_name(mod));
  82                 else if (err == KMOD_PROBE_APPLY_BLACKLIST)
  83                         log_info("Module '%s' is blacklisted", kmod_module_get_name(mod));
  84                 else
  85                         log_error("Failed to insert '%s'", kmod_module_get_name(mod));
  86
  87                 kmod_module_unref(mod);
  88         }
  89
  90         if (ctx)
  91                 ctx = kmod_unref(ctx);
  92
  93         return 0;
  94 }