r0 = socket$inet6_udp(0xa, 0x2, 0x0)
setsockopt$inet6_group_source_req(r0, 0x29, 0x2e, &(0x7f0000000000)={0x0, {{0xa, 0x0, 0x0, @mcast2}}, {{0xa, 0x0, 0x0, @private0}}}, 0x108)
r1 = socket$packet(0x11, 0x3, 0x300)
ioctl$sock_SIOCGIFINDEX(r1, 0x8933, &(0x7f0000000140)={'sit0\x00', <r2=>0x0})
setsockopt$inet6_mreq(r0, 0x29, 0x14, &(0x7f0000000000)={@mcast1, r2}, 0x14)