r0 = socket$inet6_icmp_raw(0xa, 0x3, 0x3a)
ioctl$sock_SIOCGIFINDEX(r0, 0x8933, &(0x7f0000000140)={'lo\x00', <r1=>0x0})
ioctl$sock_inet6_SIOCSIFDSTADDR(r0, 0x8918, &(0x7f0000000040)={@mcast1, 0x0, r1})