r0 = socket$inet6_tcp(0xa, 0x1, 0x0)
bind$inet6(r0, &(0x7f0000000040)={0xa, 0x4e20, 0x0, @ipv4={'\x00', '\xff\xff', @empty}}, 0x1c)
connect$inet6(r0, &(0x7f0000000000)={0xa, 0x4e20, 0x0, @empty}, 0x1c)
setsockopt$inet6_IPV6_ADDRFORM(r0, 0x29, 0x1, &(0x7f0000000140), 0x4)
setsockopt$inet6_tcp_int(r0, 0x6, 0x19, &(0x7f00000000c0)=0x6, 0x4)
sendmsg$inet6(r0, &(0x7f00000006c0)={0x0, 0x31, &(0x7f0000000540)=[{&(0x7f0000000100)=':\x00', 0xffffff3f}], 0x1}, 0x10004010)