[glibc] socket: Do not use AF_NETLINK in __opensock

[Florian Weimer]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=3d981795cd00cc9b73c3ee5087c308361acd62e5

commit 3d981795cd00cc9b73c3ee5087c308361acd62e5
Author: Florian Weimer <fweimer@redhat.com>
Date:   Mon Nov 22 14:41:14 2021 +0100

    socket: Do not use AF_NETLINK in __opensock
    
    It is not possible to use interface ioctls with netlink sockets
    on all Linux kernels.
    
    Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

Diff:
---
 socket/opensock.c | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/socket/opensock.c b/socket/opensock.c
index ff94d27a61..3e35821f91 100644
--- a/socket/opensock.c
+++ b/socket/opensock.c
@@ -24,17 +24,10 @@
 int
 __opensock (void)
 {
-  /* SOCK_DGRAM is supported by all address families.  (Netlink does
-     not support SOCK_STREAM.)  */
+  /* SOCK_DGRAM is supported by all address families.  */
   int type = SOCK_DGRAM | SOCK_CLOEXEC;
   int fd;
 
-#ifdef AF_NETLINK
-  fd = __socket (AF_NETLINK, type, 0);
-  if (fd >= 0)
-    return fd;
-#endif
-
   fd = __socket (AF_UNIX, type, 0);
   if (fd >= 0)
     return fd;