r0 = socket$inet6_udp(0xa, 0x2, 0x0)
ioctl$sock_ipv6_tunnel_SIOCCHGTUNNEL(r0, 0x89f3, &(0x7f0000000940)={'sit0\x00', &(0x7f00000008c0)={'ip6_vti0\x00', 0x0, 0x2f, 0x0, 0x0, 0x0, 0x0, @mcast1, @private1}})