lib:socket: detect link speed with ethtool ioctl in get_interfaces (on linux)

[samba.git] / lib / socket / interfaces.c

diff --git a/lib/socket/interfaces.c b/lib/socket/interfaces.c
index e18fb07ffc19a4aa706fbf5063c72378069a2594..98341e2ba0794d1a5e2535117a0cbc4251caa5ee 100644 (file)
--- a/lib/socket/interfaces.c
+++ b/lib/socket/interfaces.c
@@ -26,6 +26,11 @@
 #include "lib/util/tsort.h"
 #include "librpc/gen_ndr/ioctl.h"
 
+#ifdef HAVE_ETHTOOL
+#include "linux/sockios.h"
+#include "linux/ethtool.h"
+#endif
+
 /****************************************************************************
  Create a struct sockaddr_storage with the netmask bits set to 1.
 ****************************************************************************/
@@ -120,6 +125,47 @@ void make_net(struct sockaddr_storage *pss_out,
        make_bcast_or_net(pss_out, pss_in, nmask, false);
 }
 
+#ifdef HAVE_ETHTOOL
+static void query_iface_speed_from_name(const char *name, uint64_t *speed)
+{
+       int ret = 0;
+       struct ethtool_cmd ecmd;
+       struct ethtool_value edata;
+       struct ifreq ifr;
+       int fd;
+
+       fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
+       if (fd == -1) {
+               DBG_ERR("Failed to open socket.");
+               return;
+       }
+
+       strncpy(ifr.ifr_name, name, IF_NAMESIZE);
+
+       ifr.ifr_data = (void *)&edata;
+       edata.cmd = ETHTOOL_GLINK;
+       ret = ioctl(fd, SIOCETHTOOL, &ifr);
+       if (ret == -1) {
+               goto done;
+       }
+       if (edata.data == 0) {
+               /* no link detected */
+               *speed = 0;
+               goto done;
+       }
+
+       ifr.ifr_data = (void *)&ecmd;
+       ecmd.cmd = ETHTOOL_GSET;
+       ret = ioctl(fd, SIOCETHTOOL, &ifr);
+       if (ret == -1) {
+               goto done;
+       }
+       *speed = (ethtool_cmd_speed(&ecmd)) * 1000 * 1000;
+
+done:
+       (void)close(fd);
+}
+#endif
 
 /****************************************************************************
  Try the "standard" getifaddrs/freeifaddrs interfaces.
@@ -222,6 +268,9 @@ static int _get_interfaces(TALLOC_CTX *mem_ctx, struct iface_struct **pifaces)
                                "%s\n", ifptr->ifa_name, strerror(errno));
                }
 
+#ifdef HAVE_ETHTOOL
+               query_iface_speed_from_name(ifptr->ifa_name, &if_speed);
+#endif
                ifaces[total].linkspeed = if_speed;
                ifaces[total].capability = FSCTL_NET_IFACE_NONE_CAPABLE;