PF_TT_TIMEOUT
snl_add_msg_attr_u32(nw, PF_TT_TIMEOUT, timeouts[i]);
{ .type = PF_TT_TIMEOUT, .off = 0, .cb = snl_attr_get_pf_timeout },
{ .type = PF_TT_TIMEOUT, .off = 0, .cb = nlattr_get_pf_timeout },