r0 = socket$inet6_udp(0xa, 0x2, 0x0)
setsockopt$inet6_IPV6_ADDRFORM(r0, 0x29, 0x11, &(0x7f0000000040), 0x4)
connect$inet6(r0, &(0x7f0000000000)={0xa, 0x0, 0x0, @mcast2}, 0x1c)