udev: link-config: add ethtool support

This adds support for setting the link speed, duplex and WakeOnLan
settings.

Example:

[Link]
SpeedMBytes=100
Duplex=half
WakeOnLan=magic

1 files changed, 143 insertions, 0 deletions

diff --git a/src/udev/net/ethtool-util.c b/src/udev/net/ethtool-util.c
new file mode 100644
index 0000000000..0a4118c6ae
--- /dev/null
+++ b/src/udev/net/ethtool-util.c
@@ -0,0 +1,143 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright (C) 2013 Tom Gundersen <teg@jklm.no>
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <sys/ioctl.h>
+#include <net/if.h>
+#include <linux/ethtool.h>
+#include <linux/sockios.h>
+
+#include "ethtool-util.h"
+
+#include "strxcpyx.h"
+#include "util.h"
+#include "log.h"
+
+int ethtool_connect(int *ret) {
+        int fd;
+
+        assert_return(ret, -EINVAL);
+
+        fd = socket(PF_INET, SOCK_DGRAM, 0);
+        if (fd < 0) {
+                return -errno;
+        }
+
+        *ret = fd;
+
+        return 0;
+}
+
+int ethtool_set_speed(int fd, const char *ifname, const unsigned int speed, const char *duplex)
+{
+        struct ifreq ifr;
+        struct ethtool_cmd ecmd;
+        bool need_update;
+        int r;
+
+        if (speed == 0 && !duplex)
+                return 0;
+
+        memset(&ecmd, 0x00, sizeof(struct ethtool_cmd));
+        ecmd.cmd = ETHTOOL_GSET;
+        memset(&ifr, 0x00, sizeof(struct ifreq));
+        strscpy(ifr.ifr_name, IFNAMSIZ, ifname);
+        ifr.ifr_data = (void *)&ecmd;
+
+        r = ioctl(fd, SIOCETHTOOL, &ifr);
+        if (r < 0)
+                return -errno;
+
+        if (ethtool_cmd_speed(&ecmd) != speed) {
+                ethtool_cmd_speed_set(&ecmd, speed);
+                need_update = true;
+        }
+
+        if (duplex) {
+                if (streq(duplex, "half")) {
+                        if (ecmd.duplex != DUPLEX_HALF) {
+                                ecmd.duplex = DUPLEX_HALF;
+                                need_update = true;
+                        }
+                } else if (streq(duplex, "full"))
+                        if (ecmd.duplex != DUPLEX_FULL) {
+                                ecmd.duplex = DUPLEX_FULL;
+                                need_update = true;
+                        }
+        }
+
+        if (need_update) {
+                ecmd.cmd = ETHTOOL_SSET;
+
+                r = ioctl(fd, SIOCETHTOOL, &ifr);
+                if (r < 0)
+                        return -errno;
+        }
+
+        return 0;
+}
+
+int ethtool_set_wol(int fd, const char *ifname, const char *wol) {
+        struct ifreq ifr;
+        struct ethtool_wolinfo ecmd;
+        bool need_update;
+        int r;
+
+        if (!wol)
+                return 0;
+
+        memset(&ecmd, 0x00, sizeof(struct ethtool_wolinfo));
+        ecmd.cmd = ETHTOOL_GWOL;
+        memset(&ifr, 0x00, sizeof(struct ifreq));
+        strscpy(ifr.ifr_name, IFNAMSIZ, ifname);
+        ifr.ifr_data = (void *)&ecmd;
+
+        r = ioctl(fd, SIOCETHTOOL, &ifr);
+        if (r < 0)
+                return -errno;
+
+        if (streq(wol, "phy")) {
+                if (ecmd.wolopts != WAKE_PHY) {
+                        ecmd.wolopts = WAKE_PHY;
+                        need_update = true;
+                }
+        } else if (streq(wol, "magic")) {
+                if (ecmd.wolopts != WAKE_MAGIC) {
+                        ecmd.wolopts = WAKE_MAGIC;
+                        need_update = true;
+                }
+        } else if (streq(wol, "off")) {
+                if (ecmd.wolopts != 0) {
+                        ecmd.wolopts = 0;
+                        need_update = true;
+                }
+        } else
+                return -EINVAL;
+
+        if (need_update) {
+                ecmd.cmd = ETHTOOL_SWOL;
+
+                r = ioctl(fd, SIOCETHTOOL, &ifr);
+                if (r < 0)
+                        return -errno;
+        }
+
+        return 0;
+}