r0 = socket$inet6_udp(0xa, 0x2, 0x0)
ioctl$sock_ipv6_tunnel_SIOCADDTUNNEL(r0, 0x89f1, &(0x7f0000000940)={'sit0\x00', &(0x7f00000008c0)={'ip6gre0\x00', 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, @mcast1, @remote}})