net/l2tp: don't fall back on UDP [get|set]sockopt

The l2tp [get|set]sockopt() code has fallen back to the UDP functions
for socket option levels != SOL_PPPOL2TP since day one, but that has
never actually worked, since the l2tp socket isn't an inet socket.

As David Miller points out:

  "If we wanted this to work, it'd have to look up the tunnel and then
   use tunnel->sk, but I wonder how useful that would be"

Since this can never have worked so nobody could possibly have depended
on that functionality, just remove the broken code and return -EINVAL.

Reported-by: Sasha Levin <sasha.levin@oracle.com>
Acked-by: James Chapman <jchapman@katalix.com>
Acked-by: David Miller <davem@davemloft.net>
Cc: Phil Turnbull <phil.turnbull@oracle.com>
Cc: Vegard Nossum <vegard.nossum@oracle.com>
Cc: Willy Tarreau <w@1wt.eu>
Cc: stable@vger.kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd)
{
	for (;;) {
		pd->tunnel = l2tp_tunnel_find_nth(net, pd->tunnel_idx);
		pd->tunnel_idx++;

		if (pd->tunnel == NULL)
			break;

		/* Ignore L2TPv3 tunnels */
		if (pd->tunnel->version < 3)
			break;
	}
}

static void pppol2tp_next_tunnel(struct net *net, struct pppol2tp_seq_data *pd)
{
	for (;;) {
		pd->tunnel = l2tp_tunnel_find_nth(net, pd->tunnel_idx);
		pd->tunnel_idx++;

		if (pd->tunnel == NULL)
			break;

		/* Ignore L2TPv3 tunnels */
		if (pd->tunnel->version < 3)
			break;
	}
}
