sd-device/networkd: unify code to get a socket for issuing netdev ioctls on

As suggested here:

https://github.com/systemd/systemd/pull/4296#issuecomment-251911349

Let's try AF_INET first as socket, but let's fall back to AF_NETLINK, so that
we can use a protocol-independent socket here if possible. This has the benefit
that our code will still work even if AF_INET/AF_INET6 is made unavailable (for
exmple via seccomp), at least on current kernels.

1 files changed, 3 insertions, 3 deletions

diff --git a/src/udev/net/ethtool-util.c b/src/udev/net/ethtool-util.c
index b1aa0223fd..708a665576 100644
--- a/src/udev/net/ethtool-util.c
+++ b/src/udev/net/ethtool-util.c
@@ -25,6 +25,7 @@
 #include "conf-parser.h"
 #include "ethtool-util.h"
 #include "log.h"
+#include "socket-util.h"
 #include "string-table.h"
 #include "strxcpyx.h"
 #include "util.h"
@@ -59,10 +60,9 @@ int ethtool_connect(int *ret) {
 
         assert_return(ret, -EINVAL);
 
-        fd = socket(PF_INET, SOCK_DGRAM, 0);
+        fd = socket_ioctl_fd();
         if (fd < 0)
-                return -errno;
-
+                return fd;
         *ret = fd;
 
         return 0;