src/udev/net/ethtool-util.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4  This file is part of systemd.
   5
   6  Copyright (C) 2013 Tom Gundersen <teg@jklm.no>
   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 <net/if.h>
  23 #include <sys/ioctl.h>
  24 #include <linux/ethtool.h>
  25 #include <linux/sockios.h>
  26
  27 #include "conf-parser.h"
  28 #include "ethtool-util.h"
  29 #include "log.h"
  30 #include "string-table.h"
  31 #include "strxcpyx.h"
  32 #include "util.h"
  33
  34 static const char* const duplex_table[_DUP_MAX] = {
  35         [DUP_FULL] = "full",
  36         [DUP_HALF] = "half"
  37 };
  38
  39 DEFINE_STRING_TABLE_LOOKUP(duplex, Duplex);
  40 DEFINE_CONFIG_PARSE_ENUM(config_parse_duplex, duplex, Duplex, "Failed to parse duplex setting");
  41
  42 static const char* const wol_table[_WOL_MAX] = {
  43         [WOL_PHY] = "phy",
  44         [WOL_MAGIC] = "magic",
  45         [WOL_OFF] = "off"
  46 };
  47
  48 DEFINE_STRING_TABLE_LOOKUP(wol, WakeOnLan);
  49 DEFINE_CONFIG_PARSE_ENUM(config_parse_wol, wol, WakeOnLan, "Failed to parse WakeOnLan setting");
  50
  51 int ethtool_connect(int *ret) {
  52         int fd;
  53
  54         assert_return(ret, -EINVAL);
  55
  56         fd = socket(PF_INET, SOCK_DGRAM, 0);
  57         if (fd < 0)
  58                 return -errno;
  59
  60         *ret = fd;
  61
  62         return 0;
  63 }
  64
  65 int ethtool_get_driver(int *fd, const char *ifname, char **ret) {
  66         struct ethtool_drvinfo ecmd = {
  67                 .cmd = ETHTOOL_GDRVINFO
  68         };
  69         struct ifreq ifr = {
  70                 .ifr_data = (void*) &ecmd
  71         };
  72         char *d;
  73         int r;
  74
  75         if (*fd < 0) {
  76                 r = ethtool_connect(fd);
  77                 if (r < 0)
  78                         return log_warning_errno(r, "link_config: could not connect to ethtool: %m");
  79         }
  80
  81         strscpy(ifr.ifr_name, IFNAMSIZ, ifname);
  82
  83         r = ioctl(*fd, SIOCETHTOOL, &ifr);
  84         if (r < 0)
  85                 return -errno;
  86
  87         d = strdup(ecmd.driver);
  88         if (!d)
  89                 return -ENOMEM;
  90
  91         *ret = d;
  92         return 0;
  93 }
  94
  95 int ethtool_set_speed(int *fd, const char *ifname, unsigned int speed, Duplex duplex) {
  96         struct ethtool_cmd ecmd = {
  97                 .cmd = ETHTOOL_GSET
  98         };
  99         struct ifreq ifr = {
 100                 .ifr_data = (void*) &ecmd
 101         };
 102         bool need_update = false;
 103         int r;
 104
 105         if (speed == 0 && duplex == _DUP_INVALID)
 106                 return 0;
 107
 108         if (*fd < 0) {
 109                 r = ethtool_connect(fd);
 110                 if (r < 0)
 111                         return log_warning_errno(r, "link_config: could not connect to ethtool: %m");
 112         }
 113
 114         strscpy(ifr.ifr_name, IFNAMSIZ, ifname);
 115
 116         r = ioctl(*fd, SIOCETHTOOL, &ifr);
 117         if (r < 0)
 118                 return -errno;
 119
 120         if (ethtool_cmd_speed(&ecmd) != speed) {
 121                 ethtool_cmd_speed_set(&ecmd, speed);
 122                 need_update = true;
 123         }
 124
 125         switch (duplex) {
 126                 case DUP_HALF:
 127                         if (ecmd.duplex != DUPLEX_HALF) {
 128                                 ecmd.duplex = DUPLEX_HALF;
 129                                 need_update = true;
 130                         }
 131                         break;
 132                 case DUP_FULL:
 133                         if (ecmd.duplex != DUPLEX_FULL) {
 134                                 ecmd.duplex = DUPLEX_FULL;
 135                                 need_update = true;
 136                         }
 137                         break;
 138                 default:
 139                         break;
 140         }
 141
 142         if (need_update) {
 143                 ecmd.cmd = ETHTOOL_SSET;
 144
 145                 r = ioctl(*fd, SIOCETHTOOL, &ifr);
 146                 if (r < 0)
 147                         return -errno;
 148         }
 149
 150         return 0;
 151 }
 152
 153 int ethtool_set_wol(int *fd, const char *ifname, WakeOnLan wol) {
 154         struct ethtool_wolinfo ecmd = {
 155                 .cmd = ETHTOOL_GWOL
 156         };
 157         struct ifreq ifr = {
 158                 .ifr_data = (void*) &ecmd
 159         };
 160         bool need_update = false;
 161         int r;
 162
 163         if (wol == _WOL_INVALID)
 164                 return 0;
 165
 166         if (*fd < 0) {
 167                 r = ethtool_connect(fd);
 168                 if (r < 0)
 169                         return log_warning_errno(r, "link_config: could not connect to ethtool: %m");
 170         }
 171
 172         strscpy(ifr.ifr_name, IFNAMSIZ, ifname);
 173
 174         r = ioctl(*fd, SIOCETHTOOL, &ifr);
 175         if (r < 0)
 176                 return -errno;
 177
 178         switch (wol) {
 179                 case WOL_PHY:
 180                         if (ecmd.wolopts != WAKE_PHY) {
 181                                 ecmd.wolopts = WAKE_PHY;
 182                                 need_update = true;
 183                         }
 184                         break;
 185                 case WOL_MAGIC:
 186                         if (ecmd.wolopts != WAKE_MAGIC) {
 187                                 ecmd.wolopts = WAKE_MAGIC;
 188                                 need_update = true;
 189                         }
 190                         break;
 191                 case WOL_OFF:
 192                         if (ecmd.wolopts != 0) {
 193                                 ecmd.wolopts = 0;
 194                                 need_update = true;
 195                         }
 196                         break;
 197                 default:
 198                         break;
 199         }
 200
 201         if (need_update) {
 202                 ecmd.cmd = ETHTOOL_SWOL;
 203
 204                 r = ioctl(*fd, SIOCETHTOOL, &ifr);
 205                 if (r < 0)
 206                         return -errno;
 207         }
 208
 209         return 0;
 210 }